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

public class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int i,co=0,st=0;
        int n = in.nextInt();
        int a = in.nextInt();
        int b = in.nextInt();
        int c = in.nextInt();
        int d = in.nextInt();
        String s = "";
        if(a == c || b == d)
        {
            if(a == c && b == d)
                System.out.println("0");
            else if(a == c)
            {
                if(Math.abs(b-d)%2 == 0)
                {
                    if(b>d)
                    {
                        for(i=d;i<=b;i=i-2)
                        {   s=s+" L";
                         st++;
                        }
                    }
                    else
                    {
                         for(i=b;i<=d;i=i+2)
                         { s=s+" R";st++;}
                    }
                    System.out.println(st);
                    System.out.println(s.substring(1));
                }
                else
                    System.out.println("Impossible");
            }
            else if( b == d)
            {
                if(Math.abs(a-c)%2 == 0)
                {
                    if(a<c)
                    {
                        for(i=a;i<(a+c)/2;i=i+2)
                        { s=s+" LR";st++;}
                        for(i=((a+c)/2)+2;i<=c;i=i+2)
                        {s=s+" LL";st++;}
                        System.out.println(st);
                       System.out.println(s.substring(1));
                    }
                    else
                    {
                        for(i=a;i<(a+c)/2;i=i-2)
                        {s=s+" UL";st++;}
                        for(i=((a+c)/2)+2;i<=c;i=i-2)
                        {s=s+" UR";st++;}
                        System.out.println(st);
                       System.out.println(s.substring(1));
                    }
                }
                 else
                    System.out.println("Impossible");
            }
        }
        else if(Math.abs(a-c)%2!=0)
             System.out.println("Impossible");
        else if(a<c)
        {co=0;
            if(d<b)
            {
                for(i=a;i<c;i=i+2)
                {
                    co++;
                    s=s+" LR";st++;
                }
                if(Math.abs((b-d)-co)==0){
                    System.out.println(st);
                    System.out.println(s.substring(1));
                }
                else if(Math.abs((b-d)-co)%2 == 0)
                {
                    for(i=co;i<Math.abs(b-d);i=i+2)
                    {s=s+" R";st++;}
                    System.out.println(st);
                   System.out.println(s.substring(1));
                }
                else
                    System.out.println("Impossible");
            }
            else
            {
                for(i=a;i<c;i=i+2)
                {
                    co++;
                    s=s+" LL";st++;
                }
                if(Math.abs((d-b)-co)==0){
                    System.out.println(st);
                    System.out.println(s.substring(1));}
               else if(Math.abs((d-b)-co)%2 == 0)
                {
                    for(i=co;i<Math.abs(b-d);i=i+2)
                    {s=s+" L";st++;}
                   System.out.println(st);
                  System.out.println(s.substring(1));
                }
               else
                    System.out.println("Impossible");
            }
        }
        else
        {
            if(d<b)
            {
                for(i=a;i>=c+2;i=i-2)
                {
                    co++;
                    s=s+" UL";st++;
                    //System.out.println(st + " * ");
                }
                if(Math.abs((b-d)-co)==0){
                    System.out.println(st);
                    System.out.println(s.substring(1));}
                else if(Math.abs((b-d)-co)%2 == 0)
                {
                    for(i=co;i<Math.abs(b-d);i=i+2)
                    {s=s+" L";st++;}
                    System.out.println(st);
                   System.out.println(s.substring(1));
                }
                else
                    System.out.println("Impossible");
            }
            else
            {
                for(i=a;i>=c+2;i=i-2)
                {
                    co++;
                    s=s+" UR";st++;
                }
                if(Math.abs((d-b)-co)==0){
                    System.out.println(st);
                   System.out.println(s.substring(1));}
               else if(Math.abs((d-b)-co)%2 == 0)
                {
                    for(i=co;i<Math.abs(b-d);i=i+2)
                    {s=s+" R";st++;}
                   System.out.println(st);
                   System.out.println(s.substring(1));
                }
               else
                    System.out.println("Impossible");
            }
        }
            
        
    }
}