#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <string>

using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int n,i;
    cin>>n;
    int a[4];
    for(i=0; i<4; i++){
        cin>>a[i];
    }
    if((a[0]-a[2])%2!=0 || (a[1]-a[3]==0 && (a[0]-a[2]%4!=0) || (a[0]==a[2] && abs(a[1]-a[3])%2!=0) || (a[0]!=a[2] && abs(a[1]-a[3])%2==0 && a[1]-a[3]!=0))){cout<<"Impossible";}
    else{
        int count=0;
        string s;
    while(a[0]-a[2]!=0 || a[1]-a[3]!=0){
        int x=a[0]-a[2], y=a[1]-a[3];
        if(x>0 && y<0){
            s.append("UR ");
            a[0]=a[0]-2;
            a[1]=a[1]+1;
            count++;
            continue;
        }
         if(x>0 && y>0){
            s.append("UL ");
            a[0]=a[0]-2;
            a[1]=a[1]-1;
              count++;
             continue;
        }
        if(x==0 && y>0){
            s.append("L ");
            a[1]=a[1]-2;
             count++;
            continue;
        }
        if(x==0 && y<0){
            s.append("R ");
            a[1]=a[1]+2;
             count++;
            continue;
        }
        if(x<0 && y<0 && abs(x)-abs(y)==1){
            s.append("R ");
            a[1]=a[1]+2;
             count++;
            continue;
        }
        if(x<0 && y<0 && abs(x)-abs(y)!=1){
            cout<<"LR"<<" ";
            a[0]=a[0]+2;
            a[1]=a[1]+1;
             count++;
            continue;
        }
        if(x<0 && y>0 && abs(x)-abs(y)==1){
            s.append("L ");
            a[1]=a[1]-2;
             count++;
            continue;
        }
        if(x<0 && y>0 && abs(x)-abs(y)!=1){
            s.append("LL ");
            a[0]=a[0]+2;
            a[1]=a[1]-1;
             count++;
            continue;
        } 
        if(x%4==0 && y==0 && x<0){
            s.append("LR LL ");
            a[0]=a[0]+4;
             count=count+2;
            continue;
        }
         if(x%4==0 && y==0 && x>0){
            s.append("UR UL ");
            a[0]=a[0]-4;
             count=count+2;
            continue;
        }
      }
        cout<<count<<endl;
        cout<<s;
   } 
    return 0;
}