using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
class Solution {

    static void printShortestPath(int n, int j_start, int i_start, int j_end, int i_end) {
        if(Math.Abs(j_start - j_end)%2!=0) {
            Console.WriteLine("Impossible");
            return;
        }
        if(i_start == i_end && Math.Abs(j_start - j_end)%4!=0) {
            Console.WriteLine("Impossible");
            return;
        }
        var num = 0;
         var moves = new List<string>();
        while(j_start != j_end){
            var goup = j_start>j_end;
            var goleft = i_start > i_end;
            
            if(goup && goleft){
                j_start-=2;
                i_start-=1;
                moves.Add("UL");
                continue;
            }
            if(!goup && goleft){
                j_start+=2;
                i_start-=1;
                moves.Add("LL");
                continue;
            }
            if(goup && !goleft){
                j_start-=2;
                i_start+=1;
                moves.Add("UR");
                continue;
            }
            if(!goup && !goleft){
                j_start+=2;
                i_start+=1;
                moves.Add("LR");
                continue;
            }
        }
        
        if(Math.Abs(i_start - i_end)%2!=0) {Console.WriteLine("Impossible"); return;}
        while(i_start != i_end){
            if(i_start > i_end){
                i_start-=2;
                moves.Add("L");
            }else{
                i_start+=2;
                moves.Add("R");
            }
        }
        Console.WriteLine(moves.Count);
        Console.WriteLine(string.Join(" ",moves));
    }

    static void Main(String[] args) {
        int n = Convert.ToInt32(Console.ReadLine());
        string[] tokens_i_start = Console.ReadLine().Split(' ');
        int i_start = Convert.ToInt32(tokens_i_start[0]);
        int j_start = Convert.ToInt32(tokens_i_start[1]);
        int i_end = Convert.ToInt32(tokens_i_start[2]);
        int j_end = Convert.ToInt32(tokens_i_start[3]);
        printShortestPath(n, i_start, j_start, i_end, j_end);
    }
}