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 is, int js, int ie, int je) {
        StringBuffer s=new StringBuffer("");
        int c=0;
        while(true)
        {
            if(is-1==ie&&js==je){System.out.println("Impossible");System.exit(0);}
            if(is+1==ie&&js==je){System.out.println("Impossible");System.exit(0);}
            if(is==ie&&js+1==je){System.out.println("Impossible");System.exit(0);}
            if(is==ie&&js-1==je){System.out.println("Impossible");System.exit(0);}
            if(is-1==ie&&js-1==je){System.out.println("Impossible");System.exit(0);}
            if(is-1==ie&&js+1==je){System.out.println("Impossible");System.exit(0);}
            if(is+1==ie&&js-1==je){System.out.println("Impossible");System.exit(0);}
            if(is+1==ie&&js+1==je){System.out.println("Impossible");System.exit(0);}
            if(is==ie&&js==je){System.out.println(c+"\n"+s);System.exit(0);}
            if(is==ie&&je>=js)
            {c++;s.append("R ");js+=2;continue;}
            if(is==ie&&je<=js)
            {c++;s.append("L ");js-=2;continue;}
            if(ie<=is&&je<=js)
            {c++;s.append("UL ");is-=2;js-=1;continue;}
            if(ie<=is&&je>=js)
            {c++;s.append("UR ");is-=2;js+=1;continue;}
            if(ie>=is&&je>=js)
            {c++;s.append("LR ");is+=2;js+=1;continue;}
            if(ie>=is&&je<=js)
            {c++;s.append("LL ");is+=2;js-=1;continue;}
        }
    }

    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();
    }
}