using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
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.
            int noOfMoves = 0;
            string moves = string.Empty;
            if ((Math.Abs(i_start - i_end) % 2 == 1))
                Console.WriteLine("Impossible");
            else
            {
                if (i_start == i_end)
                {
                    if (Math.Abs(j_start - j_end) % 2 == 0)
                    {
                        if (j_start < j_end)
                        {
                            noOfMoves = (j_end - j_start) / 2;
                            for (int i_temp = 0; i_temp < noOfMoves; i_temp++)
                            {
                                if (i_temp == 0)
                                    moves = moves + "R";
                                else
                                    moves = moves + " " + "R";
                            }
                            Console.WriteLine(noOfMoves);
                            Console.WriteLine(moves);

                        }
                        else
                        {

                            noOfMoves = (j_start - j_end) / 2;
                            for (int i_temp = 0; i_temp < noOfMoves; i_temp++)
                            {
                                if (i_temp == 0)
                                    moves = moves + "L";
                                else
                                    moves = moves + " " + "L";
                            }
                            Console.WriteLine(noOfMoves);
                            Console.WriteLine(moves);

                        }
                    }
                    else
                        Console.WriteLine("Impossible");

                }
                else if (i_start < i_end)
                {

                    if (j_start == j_end)
                    {
                        if ((i_end - i_start) % 4 == 0)
                        {
                            noOfMoves = (i_end - i_start) / 2;
                            for (int i_temp = 0; i_temp < noOfMoves; i_temp++)
                            {
                                if (i_temp == 0)
                                    moves = moves + "LR";
                                else
                                {
                                    if (i_temp % 2 == 0)
                                        moves = moves + " " + "LR";
                                    else
                                        moves = moves + " " + "LL";
                                }
                            }
                            Console.WriteLine(noOfMoves);
                            Console.WriteLine(moves);

                        }
                        else
                            Console.WriteLine("Impossible");

                    }
                    else if (j_start < j_end)
                    {
                        int i_temp = i_start;
                        int j_temp = j_start;
                        while (i_temp < i_end || j_temp < j_end)
                        {
                            noOfMoves++;
                            if (i_temp == i_end)
                            {
                                moves = moves + "R" + " ";
                                j_temp = j_temp + 2;
                            }
                            else
                            {
                                moves = moves + "LR" + " ";
                                i_temp = i_temp + 2;
                                j_temp = j_temp + 1;
                            }

                        }
                        if (i_temp == i_end && j_temp == j_end)
                        {
                            Console.WriteLine(noOfMoves);
                            Console.WriteLine(moves.Substring(0, moves.Length - 1));
                        }
                        else
                            Console.WriteLine("Impossible");

                    }
                    else
                    {
                        int i_temp = i_start;
                        int j_temp = j_start;
                        while (i_temp < i_end || j_temp > j_end)
                        {
                            noOfMoves++;
                            if (i_temp == i_end)
                            {
                                moves = moves + "L" + " ";
                                j_temp = j_temp - 2;
                            }
                            else
                            {
                                moves = moves + "LL" + " ";
                                i_temp = i_temp + 2;
                                j_temp = j_temp - 1;
                            }

                        }
                        if (i_temp == i_end && j_temp == j_end)
                        {
                            Console.WriteLine(noOfMoves);
                            Console.WriteLine(moves.Substring(0, moves.Length - 1));
                        }
                        else
                            Console.WriteLine("Impossible");

                    }

                }
                else
                {

                    if (j_start == j_end)
                    {
                        if ((i_start - i_end) % 4 == 0)
                        {
                            noOfMoves = (i_start - i_end) / 2;
                            for (int i_temp = 0; i_temp < noOfMoves; i_temp++)
                            {
                                if (i_temp == 0)
                                    moves = moves + "UL";
                                else
                                {
                                    if (i_temp % 2 == 0)
                                        moves = moves + " " + "UR";
                                    else
                                        moves = moves + " " + "UL";
                                }
                            }
                            Console.WriteLine(noOfMoves);
                            Console.WriteLine(moves);

                        }
                        else
                            Console.WriteLine("Impossible");

                    }
                    else if (j_start < j_end)
                    {
                        int i_temp = i_start;
                        int j_temp = j_start;
                        while (i_temp > i_end || j_temp < j_end)
                        {
                            noOfMoves++;
                            if (i_temp == i_end)
                            {
                                moves = moves + "R" + " ";
                                j_temp = j_temp + 2;
                            }
                            else
                            {
                                moves = moves + "UR" + " ";
                                i_temp = i_temp - 2;
                                j_temp = j_temp + 1;
                            }

                        }
                        if (i_temp == i_end && j_temp == j_end)
                        {
                            Console.WriteLine(noOfMoves);
                            Console.WriteLine(moves.Substring(0, moves.Length - 1));
                        }
                        else
                            Console.WriteLine("Impossible");

                    }
                    else
                    {
                        int i_temp = i_start;
                        int j_temp = j_start;
                        while (i_temp > i_end || j_temp > j_end)
                        {
                            noOfMoves++;
                            if (i_temp == i_end)
                            {
                                moves = moves + "L" + " ";
                                j_temp = j_temp - 2;
                            }
                            else
                            {
                                moves = moves + "UL" + " ";
                                i_temp = i_temp - 2;
                                j_temp = j_temp - 1;
                            }

                        }
                        if (i_temp == i_end && j_temp == j_end)
                        {
                            Console.WriteLine(noOfMoves);
                            Console.WriteLine(moves.Substring(0, moves.Length - 1));
                        }
                        else
                            Console.WriteLine("Impossible");

                    }

                }
            }
    }

    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);
    }
}