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

class Solution
{

    static void printShortestPath(int n, int i_start, int j_start, int i_end, int j_end)
    {
        //  Print the distance along with the sequence of moves.
        string path = "";
        if (Math.Abs(i_start - i_end) % 2 == 1)
        {
            path = "Impossible";
        }
        else
        {
            int yMove = i_start - i_end;
            int xMove = j_end - j_start;

            int crossMove = Math.Abs(yMove / 2);
            for (int i = 0; i < crossMove; i++)
            {
                if (yMove > 0)
                {
                    if (xMove >= 0)
                    {
                        path += "UR ";
                        xMove--;
                    }
                    else
                    {
                        path += "UL ";
                        xMove++;
                    }
                }
                else
                {
                    if (xMove >= 0)
                    {
                        path += "LR ";
                        xMove--;
                    }
                    else
                    {
                        path += "LL ";
                        xMove++;
                    }
                }

            }
            if (Math.Abs(xMove) % 2 == 1)
            {
                path = "Impossible";
            }
            else
            {
                for (int i = 0; i < Math.Abs(xMove) / 2; i++)
                {
                    if (xMove>0)
                    {
                        path += "R ";
                    }
                    else
                    {
                        path += "L ";
                    }
                }
            }
        }
        if(path != "Impossible")
        Console.WriteLine(Regex.Matches(path, " ").Count);
        Console.WriteLine(path);
    }

    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);
    }
}