using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;

class Solution {

    static void printShortestPath(int n, int i_start, int j_start, int i_end, int j_end) {
        int iCurrent = i_start;
            int jCurrent = j_start;
            int verticalMovement = i_start - i_end;
            if (verticalMovement % 2 != 0)
            {
                Console.WriteLine("Impossible");
                return;
            }

            int numberOfMoves = 0;
            StringBuilder moveList = new StringBuilder();
            while (iCurrent != i_end || jCurrent != j_end)
            {
                numberOfMoves++;

                if (iCurrent < i_end)
                {
                    iCurrent += 2;
                    if (jCurrent <= j_end)
                    {
                        jCurrent += 1;
                        moveList.Append("LR ");
                    }
                    else if (jCurrent > j_end)
                    {
                        jCurrent -= 1;
                        moveList.Append("LL ");
                    }
                }
                else if (iCurrent > i_end)
                {
                    iCurrent -= 2;
                    if (jCurrent <= j_end)
                    {
                        jCurrent += 1;
                        moveList.Append("UR ");
                    }
                    else if (jCurrent > j_end)
                    {
                        jCurrent -= 1;
                        moveList.Append("UL ");
                    }
                }
                else
                {
                    if (jCurrent < j_end)
                    {
                        jCurrent += 2;
                        moveList.Append("R ");
                    }
                    else if (jCurrent > j_end)
                    {
                        jCurrent -= 2;
                        moveList.Append("L ");
                    }
                }
            }

            Console.WriteLine(numberOfMoves);
            Console.WriteLine(moveList.ToString().Trim());
    }

    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);
    }
}