#!/bin/python3

import sys
from collections import *

MOVES_STR= ("UL", "UR", "R", "LR", "LL", "L")
MOVES    = ( (-2,-1), (-2,1), (0,2), (2,1), (2,-1), (0,-2)) 
def solve(r0, c0, r1, c1, F, P, N):
    q=deque([(r0,c0)])
    F[r0][c0]=0
    #P[r0][c0]=""
    while q:
        r,c=q.popleft()
        f=F[r][c]
        p=P[r][c]
        if r==r1 and c==c1:
            return (f,p)
        for i,dd in enumerate(MOVES):
            nr, nc = r+dd[0], c+dd[1]
            if nr<0 or nc<0 or nr>=N or nc>=N:
                continue
            if F[nr][nc]==None:
                F[nr][nc]=f+1
                P[nr][nc]=p+" "+MOVES_STR[i]
                q.append( (nr,nc) )
    return (0, [])

if __name__ == "__main__":
    N = int(input().strip())
    F = [[None]*N for _ in range(N)]
    P = [[""]  *N for _ in range(N)]
    r0, c0, r1, c1 = map(int, input().strip().split(' '))
    res=solve(r0, c0, r1, c1, F, P, N)
    if res[0]==0:
        print("Impossible")
    else:
        print(res[0])
        print(res[1][1:])