#!/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 = i_end - i_start
    x = j_end - j_start
    if abs(y)%2 != 0 or abs(abs(x) - abs(y)//2)%2 != 0:
        print("Impossible")
        return
    res = []
    while True:
        if y > 0:
            if x > 0:
                for t in range(0,y,2):
                    x -= 1
                    res.append('4')
                y %= 2
            elif x < 0:
                for t in range(0,y,2):
                    x += 1
                    res.append('5')
                y %= 2
            else:
                for t in range(0,y,4):
                    res.append('4')
                    res.append('5')
                y %= 4    
                
        elif y < 0:
            if x > 0:
                for t in range(0,abs(y),2):
                    x -= 1
                    res.append('2')
                y = abs(y)%2
            elif x < 0:
                for t in range(0,abs(y),2):
                    x += 1
                    res.append('1')
                y = -abs(y)%2
            else:
                for t in range(0,abs(y),4):
                    res.append('1')
                    res.append('2')
                y = -abs(y)%4
        
        elif  y == 0:
            if x > 0:
                for t in range(0,x,2):
                    res.append('3')
                x = abs(x)%2
                 
            elif x < 0:
                for t in range(0,abs(x),2):
                    res.append('6')
                x = -abs(x)%2
            else:
                break
    print(len(res))
    res.sort()
    string = ''
    s = ''
    for x in res:
        if(x == '1'):
            string += 'UL' + " "
        elif x == '2':
            string += 'UR' + " "
        elif x == '3':
            string += 'R' + " "
        elif x == '4':
            string += 'LR' + " "
        elif x == '5':
            string += 'LL' + " "
        elif x == '6':
            string += 'L' + " "
    print(string)
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)