import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    static void printShortestPath(int n, int i_start, int j_start, int i_end, int j_end) {
        
        String seq  ="";
        int i = 0;
        
        while(i<n)
        {
            if(Math.abs(i_start-i_end) %2 == 1)
            {
                System.out.println("Impossible");
                return;
            }
        if((i_start-i_end)==0 && (j_start - j_end)==0)
        {
             System.out.println(i+"\n"+seq.trim());
            return;
        }  
        
        if((i_start-i_end)>0 && (j_start - j_end)>=0)
        {
            i_start -= 2;
            j_start -= 1;
            seq += "UL ";
        }
        else if((i_start - i_end) > 0 && (j_start - j_end) <= 0)
        {
            i_start -= 2;
            j_start += 1;
            seq += "UR ";
        }
        else if((i_start - i_end) == 0 && (j_start - j_end) <= 0)
        {
            
            j_start += 2;
            seq += "R ";
        }
        else if((i_start - i_end) < 0 && (j_start - j_end) <= 0)
        {
            i_start += 2;
            j_start += 1;
            seq += "LR ";
        }
        else if((i_start - i_end) < 0 && (j_start - j_end) >= 0)
        {
            i_start += 2;
            j_start -= 1;
            seq += "LL ";
        }
        else if((i_start - i_end) == 0 && (j_start - j_end) >= 0)
        {
            j_start -= 2;
            seq += "L ";
        }
        else
        {
            System.out.println("Impossible");
            return;
        }
            i++;
        }
        System.out.println("Impossible");
        
    }

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int i_start = in.nextInt();
        int j_start = in.nextInt();
        int i_end = in.nextInt();
        int j_end = in.nextInt();
        printShortestPath(n, i_start, j_start, i_end, j_end);
        in.close();
    }
}