#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */  
    int n, i1, j1, i2, j2, cmp=0;
    string out ="";
    cin >> n >> i1 >> j1 >> i2 >> j2;
    
    if( ( ((int)fabs(j2-j1)%2 == 1) && ((int)fabs(i2-i1)%2 == 0) ) || (((int)fabs(j1-j2)%2 == 0) && ((int)fabs(i1-i2)%4 == 0)) ){
        
             //while( ((i1 =! i2 && j1 != j2) || (i1 == i2 && j1 != j2) ||(i1 =! i2 && j1 == j2)) && cmp<4 ){
               for(int i=0; i<10000 ; i++){
                   int t1=i1, t2=i1, tf1= j1, tf2=j2;
                if( (i1 > i2) && (j1 >= j2) ){
                    
                    i1 -= 2;
                    j1 -= 1;
                    out.append("UL ");
                }else if( (i1 > i2) && (j1 < j2)){
                    
                    i1 -= 2;
                    j1 += 1;
                    out.append("UR ");
                    
                }else if( (j1 < j2) && (i1 == i2)){
                    
                    j1 += 2;
                    out.append("R ");
                    
                }else if( (i1 < i2) && (j1 <= j2) ){
                    
                    i1 += 2;
                    j1 += 1;
                    out.append("LR ");
                    
                }else if( (i1 < i2) && (j1 >j2) ){
                    
                    i1 += 2;
                    j1 -= 1;
                    out.append("LL ");
                    
                }else if((j1 > j2) && (i1 == i2)){
                    
                    j1 -= 2;
                    out.append("L");
                }
                   if(t1!=i1 || t2!=i1 || tf1 != j1 || tf2!=j2){
                       cmp++;
                   }else{
                       break;
                   }
            }
            cout << cmp << endl << out << endl;
     
    }else{
            cout << "Impossible" << endl;
        }
    return 0;
}