#!/bin/python3

import sys

def printShortestPath(n, i_start, j_start, i_end, j_end):
    cnt=0
    chk=0
    l=[]
    d1=i_start-i_end
    #print("d1 is ",d1)
    d2=j_start-j_end
    #print("d2 is ",d2)
    while(d1!=0 or d2!=0):
        if(d1%2!=0):
            print("Impossible")
            chk+=1
            break
        else:
            if(d1>0):
                x=int(d1/2)
                #print("Value of x is ",x)
                if(d2>0):
                    d2-=x
                    #print("Value of d2 becomes ",d2)
                    d1=0
                    #print("Value of d1 becomes ",d1)
                    cnt+=x
                    for i in range(x):
                        l.append("UL")
                    #print(l)
                else:
                    if(d2==0):
                        if(d1%4!=0 or j_start==0 or j_start==n-1):
                            print("Impossible")
                            chk+=1
                            break
                        else:
                            
                            d1=0
                            #print("Value of d1 becomes ",d1)
                            #print("Value of d2 is ",d2)
                            cnt+=x
                            for i in range(int(x/2)):
                                l.append("UL")
                                l.append("UR")
                            #print(l)
                    else:
                        d2+=x
                        #print("Value of d2 is ",d2)
                        d1=0
                        #print("Value of d1 is ",d1)
                        cnt+=x
                        for i in range(x):
                            l.append("UR")
                        #print(l)
            else:
                if(d1==0):
                    if(d2%2!=0):
                        print("Impossible")
                        chk+=1
                        break
                    else:
                        if(d2>0):
                            x=int(d2/2)
                            #print("Value of x is ",x)
                            cnt+=x
                            for i in range(x):
                                l.append("L")
                            #print(l)
                            d2=0
                            #print("Value of d2 is ",d2)
                        else:
                            x=int(abs(d2/2))
                            #print("Value of x is ")                            
                            cnt+=x
                            for i in range(x):
                                l.append("R")
                            #print(l)
                            d2=0
                            #print("Value of d2 is ",d2)
                else:
                    x=int(abs(d1/2))
                    #print("Value of x is ",x)
                    if(d2>0):
                        d2-=x
                        #print("Value of d2 is ",d2)
                        d1=0
                        #print("Value of d1 is ",d1)
                        cnt+=x
                        for i in range(x):
                            l.append("LL")
                        #print(l)
                    else:
                        if(d2==0):
                            if(d1%4!=0):
                                print("Impossible")
                                chk+=1
                                break
                            else:
                                d1=0
                                #print("Value of d1 is ",d1)
                                cnt+=x
                                for i in range(int(x/2)):
                                    l.append("LL")
                                    l.append("LR")
                                #print(l)
                        else:
                            d2+=x
                            d1=0
                            #print("Value of d1 is ",d1)
                            cnt+=x
                            for i in range(x):
                                l.append("LR")
    l.sort(reverse=True)
    if(chk==0):
        print(cnt)
        for i in l:
            print(i,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)]
    c=0
    lc=[i_start,i_end,j_start,j_end]
    for i in lc:
        if(i<0 or i>=n):
            c+=1
    if((n>=5 and n<=200) and c==0): 
        printShortestPath(n, i_start, j_start, i_end, j_end)