#!/bin/python3

import sys

n = int(input().strip())
x1,y1, x2, y2 = input().strip().split(' ')
x1, y1, x2, y2 = [int(x1), int(y1), int(x2), int(y2)]
a = ["UL","UR","R","LR","LL","L"]
val = []
c = ""
count1 = 0
flag = 0
while (x1!=x2 or y1!=y2):
    b = ""
    if x1 >= n or x1<0 or y1 >= n or y1 < 0 :
        print("Impossible")
        flag = 1
        break
    elif x1>x2 and y1>y2:
        x1-=2
        y1-=1
        val.append(0) #UL
        count1+=1
    elif x1<x2 and y1>y2:
        x1+=2
        y1-=1
        val.append(4) #LL
        count1+=1
    elif x1>x2 and y1<y2:
        x1-=2
        y1+=1
        val.append(1) #UR
        count1+=1
    elif x1<x2 and y1<y2:
        x1+=2
        y1+=1
        val.append(3) #LR
        count1+=1
    elif x1 == x2 and y1<y2:
        y1+=2
        val.append(2) #R
        count1+=1
    elif x1 == x2 and y1>y2:
        y1-=2
        val.append(5) #L
        count1+=1
    elif x1<x2 and y1 == y2:
        x1+=2
        y1+=1
        val.append(3) #LR
        count1+=1
    else:
        x1-=2
        y1-=1
        val.append(0) #UL
        count1+=1
if flag == 0:
    val = sorted(val)
    for i in val:
       if not c:
        c = a[i]
       else:
        c = c + " " + a[i]
    print(count1)
    print(c)