#!/bin/python3

import sys

def printShortestPath(n, i_start, j_start, i_end, j_end):
    if(abs(i_start-i_end)%2==1):
        print("Impossible")
    elif(i_start-i_end==0 and (j_start-j_end)%2!=0):
        print("Impossible")
    elif(i_start-i_end==0 and (j_start-j_end)%2==0) :
        if(j_start>j_end):
            print(int(j_start-j_end))
            for i in range(int(j_start-j_end)):
                print('L',end=' ')
        elif(j_start<j_end):
            print(int(j_end-j_start))
            for i in range(int(j_end-j_start)):
                print('R',end=' ')
    else:
        #for upper part
        if(i_start>i_end):
            v=i_start-i_end
            #for the left upper part
            if(j_start>j_end):
                lim_x=v/2
                if(j_start-j_end)>lim_x:
                    if((j_start-j_end-lim_x)%2==1):
                        print("Impossible")
                        return 0
                    else:
                        UL=int(v/2)
                        L=int((j_start-j_end-lim_x)/2)
                        #print(1)
                        print(UL+L)
                        for i in range(UL):
                            print('UL',end=' ')
                        for j in range(L):
                            print('L',end=' ')
                            
                elif(j_start-j_end)<lim_x:
                    if(lim_x%2==1):
                        if((j_start-j_end)%2)==0:
                            print("Impossible")
                            return 0
                        else:
                            UR=int(j_start-j_end)
                            UL=int(lim_x-(j_start-j_end))
                            #print(2)
                            print(UR+UL)
                            for i in range(UL):
                                print('UL',end=' ')
                            for j in range(UR):
                                print('UR',end=' ')
                    elif(lim_x%2==0):
                        if((j_start-j_end)%2)==1:
                            print("Impossible")
                            return 0
                        else:
                            UR=int(j_start-j_end)
                            UL=int(lim_x-(j_start-j_end))
                            #print(3)
                            print(UR+UL)
                            for i in range(UL):
                                print('UL',end=' ')
                            for j in range(UR):
                                print('UR',end=' ')
                elif((j_start-j_end)==lim_x):
                    #print(4)
                    print(int(lim_x))
                    for i in range(int(lim_x)):
                        print("UL",end=' ')
           #for the right upper part
            elif(j_start<j_end):
                lim_x=v/2
                if(j_end-j_start)>lim_x:
                    if((j_end-j_start-lim_x)%2==1):
                        print("Impossible")
                        return 0
                    else:
                        UR=int(v/2)
                        R=int((j_end-j_start-lim_x)/2)
                        #print(5)
                        print(UR+R)
                        for i in range(UR):
                            print('UR',end=' ')
                        for j in range(R):
                            print('R',end=' ')
                            
                elif(j_end-j_start)<lim_x:
                    if(lim_x%2==1):
                        if((j_end-j_start)%2)==0:
                            print("Impossible")
                            return 0
                        else:
                            UL=int(j_end-j_start)
                            UR=int(lim_x-(j_end-j_start))
                            #print(6)
                            print(UL+UR)
                            for i in range(UL):
                                print('UL',end=' ')
                            for j in range(UR):
                                print('UR',end=' ')
                elif(lim_x%2==0):
                        if((j_end-j_start)%2)==1:
                            print("Impossible")
                            return 0
                        else:
                            UL=int(j_end-j_start)
                            UR=int(lim_x-(j_end-j_start))
                            #print(8)
                            print(UL+UR)
                            for i in range(UL):
                                print('UL',end=' ')
                            for j in range(UR):
                                print('UR',end=' ')
                elif((j_end-j_start)==lim_x):
                    #print(9)
                    print(int(lim_x))
                    for i in range(int(lim_x)):
                        print("UR",end=' ')
            elif(j_start==j_end):
                lim_x=v/2
                if(lim_x%2==1):
                    print("Impossible")
                    return 0
                else:
                    #print(10)
                    print(int(lim_x))
                    for i in range(int(lim_x/2)):
                        print('UL',end=' ')
                    for j in range(int(lim_x/2)):
                        print('UR',end=' ')
        #LOWER PART                        
        elif(i_start<i_end):
            v=i_end-i_start
            #for the left lower part
            if(j_start>j_end):
                lim_x=v/2
                if(j_start-j_end)>lim_x:
                    if((j_start-j_end-lim_x)%2==1):
                        print("Impossible")
                        return 0
                    else:
                        UL=int(vertical/2)
                        L=int((j_start-j_end-lim_x)/2)
                        print(UL+L)
                        for i in range(UL):
                            print('LL',end=' ')
                        for j in range(L):
                            print('L',end=' ')
                            
                elif(j_start-j_end)<lim_x:
                    if(lim_x%2==1):
                        if((j_start-j_end)%2)==0:
                            print("Impossible")
                            return 0
                        else:
                            UR=int(j_start-j_end)
                            UL=int(lim_x-(j_start-j_end))
                            print(UR+UL)
                            for i in range(UR):
                                print('LR',end=' ')
                            for j in range(UL):
                                print('LL',end=' ')
                    elif(lim_x%2==0):
                        if((j_start-j_end)%2)==1:
                            print("Impossible")
                            return 0
                        else:
                            UR=int(j_start-j_end)
                            UL=int(lim_x-(j_start-j_end))
                            print(UR+UL)
                            for i in range(UR):
                                print('LR',end=' ')
                            for j in range(int(lim_x/2)):
                                print('LL',end=' ')
                elif((j_start-j_end)==lim_x):
                    print(int(lim_x))
                    for i in range(int(lim_x)):
                        print("LL",end=' ')
           #for the right lower part
            elif(j_start<j_end):
                lim_x=v/2
                if(j_end-j_start)>lim_x:
                    if((j_end-j_start-lim_x)%2==1):
                        print("Impossible")
                        return 0
                    else:
                        UR=int(v/2)
                        R=int((j_end-j_start-lim_x)/2)
                        print(UR+R)
                        for i in range(R):
                            print('R',end=' ')
                        for j in range(UR):
                            print('LR',end=' ')
                            
                elif(j_end-j_start)<lim_x:
                    if(lim_x%2==1):
                        if((j_end-j_start)%2)==0:
                            print("Impossible")
                            return 0
                        else:
                            UL=int(j_end-j_start)
                            UR=int(lim_x-(j_end-j_start))
                            print(UL+UR)
                            for i in range(UR):
                                print('LR',end=' ')
                            for j in range(UL):
                                print('LL',end=' ')
                    elif(lim_x%2==0):
                        if((j_end-j_start)%2)==1:
                            print("Impossible")
                            return 0
                        else:
                            UL=int(j_end-j_start)
                            UR=int(lim_x-(j_end-j_start))
                            print(UL+UR)
                            for i in range(UR):
                                print('LR',end=' ')
                            for j in range(UL):
                                print('LL',end=' ')
                elif((j_end-j_start)==lim_x):
                    print(int(lim_x))
                    for i in range(int(lim_x)):
                        print("LR",end=' ')        
                            
            elif(j_start==j_end):
                lim_x=vertical/2
                if(lim_x%2==1):
                    print("Impossible")
                    return 0
                else:
                    print(int(lim_x))
                    for i in range(int(lim_x/2)):
                        print('LR',end=' ')
                    for j in range(int(lim_x/2)):
                        print('LL',end=' ')    
    

if __name__ == "__main__":
    n = int(input().strip())
    i_start, j_start, i_end, j_end = input().strip().split(' ')
    i_start, j_start, i_end, j_end = [int(i_start), int(j_start), int(i_end), int(j_end)]
    printShortestPath(n, i_start, j_start, i_end, j_end)