#!/bin/python3

import sys

def printShortestPath(n, i_start, j_start, i_end, j_end):
    #  Print the distance along with the sequence of moves.
    y_direct = i_end - i_start
    x_direct = j_end - j_start
    if y_direct % 2 == 1 or (y_direct % 4 == 2 and x_direct % 2 == 0) or (y_direct % 4 == 0 and x_direct % 2 == 1):
        print("Impossible")
    elif y_direct == 0:
        if x_direct  == 0:
            print(0)
        elif x_direct > 0:
            x_step = x_direct // 2
            print(x_step)
            for i in range(x_step):
                print('R', end = " ")
        else:
            x_step = - x_direct // 2
            print(x_step)
            for i in range(x_step):
                print('L', end = " ")           
    elif abs(y_direct) <= 2 * abs(x_direct):
        if y_direct > 0 and x_direct > 0:
            slope_step = y_direct // 2
            print(slope_step + (x_direct - slope_step) // 2)
            for i in range(slope_step):
                print('LR', end = " ")
            for i in range((x_direct - slope_step) // 2):
                print('R', end = " ")
        elif y_direct < 0 and x_direct > 0:
            slope_step = - y_direct // 2
            print(slope_step + (x_direct - slope_step) // 2)
            for i in range(slope_step):
                print('UR', end = " ")
            for i in range((x_direct - slope_step) // 2):
                print('R', end = " ")
        elif y_direct < 0:
            slope_step = -y_direct // 2
            print(slope_step -(x_direct + slope_step) // 2)
            for i in range(slope_step):
                print('UL', end = " ")
            for i in range(-(x_direct + slope_step) // 2):
                print('L', end = " ")
        else:
            slope_step = y_direct // 2
            print(slope_step - (x_direct + slope_step) // 2)
            for i in range(slope_step):
                print('LL', end = " ")
            for i in range(- (x_direct + slope_step) // 2):
                print('L', end = " ")
    else:
        if y_direct > 0:
            b = (x_direct + y_direct//2 ) // 2
            a = b - x_direct
            print(a+b)
            if i_start > 0:
                if b >= a:
                    for i in range(a):
                        print("LL", end = " ")
                        print("LR", end = " ")
                    for i in range(b-a):
                        print("LR", end = " ")
                else:
                    for i in range(b):
                        print("LL", end = " ")
                        print("LR", end = " ")
                    for i in range(a-b):
                        print("LL", end = " ")
            else:
                if b >= a:
                    for i in range(a):
                        print("LR", end = " ")
                        print("LL", end = " ")
                    for i in range(b-a):
                        print("LR", end = " ")
                else:
                    for i in range(b):
                        print("LR", end = " ")
                        print("LL", end = " ")
                    for i in range(a-b):
                        print("LL", end = " ")
        else:
            b = (x_direct - y_direct//2 ) // 2
            a = b - x_direct
            print(a+b)
            if i_start > 0:
                if b >= a:
                    for i in range(a):
                        print("UL", end = " ")
                        print("UR", end = " ")
                    for i in range(b-a):
                        print("UR", end = " ")
                else:
                    for i in range(b):
                        print("UL", end = " ")
                        print("UR", end = " ")
                    for i in range(a-b):
                        print("UL", end = " ")
            else:
                if b >= a:
                    for i in range(a):
                        print("UR", end = " ")
                        print("UL", end = " ")
                    for i in range(b-a):
                        print("UR", end = " ")
                else:
                    for i in range(b):
                        print("UR", end = " ")
                        print("UL", end = " ")
                    for i in range(a-b):
                        print("UL", 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)