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

      static void printMoves(int moves, List<string> moveNames)
        {
            Console.WriteLine(moves);
            foreach (string str in moveNames)
            {
                Console.Write("{0} ", str);
            }
        }

        static void printShortestPath(int n, int i_start, int j_start, int i_end, int j_end)
        {
            int moves = 0;
            List<string> moveNames = new List<string>();

            //where is the end
            while (true)
            {
                int y = i_end - i_start;
                int x = j_end - j_start;
                
                //X>0 R ---- X<0 Left
                if (y > 0) //Low
                {
                    if (x > 0)
                    {
                        moveNames.Add("LR");
                        i_start += 2;
                        j_start += 1;
                        moves++;
                    }
                    else if (x == 0)
                    {
                        Console.WriteLine("Impossible");
                        return;
                    }
                    else if (x < 0)
                    {
                        moveNames.Add("LL");
                        i_start += 2;
                        j_start -= 1;
                        moves++;
                    }

                }
                else if (y == 0)//No U or Low
                {
                    if (x > 0)
                    {
                        moveNames.Add("R");
                        moves++;
                        printMoves(moves, moveNames);
                        return;

                    }
                    else if (x == 0)
                    {
                        printMoves(moves, moveNames);
                        return;
                    }

                    else if (x < 0)
                    {
                        moveNames.Add("L");
                        moves++;
                        printMoves(moves, moveNames);
                        return;
                    }

                }
                else if (y < 0)//Up
                {
                    if (x > 0)
                    {
                        moveNames.Add("UR");
                        i_start -= 2;
                        j_start += 1;
                        moves++;
                    }
                    else if (x == 0)
                    {
                        Console.WriteLine("Impossible");
                        return;
                    }
                    else if (x < 0)
                    {
                        moveNames.Add("UL");
                        i_start -= 2;
                        j_start -= 1;
                        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);
    }
}