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

int mod(int a){
    return (a>0)?a:(-a);
}

int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int n;
    cin>>n;
    int i,j,k;
    int sa,sb,da,db;
    cin>>sa>>sb>>da>>db;
    if(mod(sa-da)%2==1){
        cout<<"Impossible\n";return 0;
    }
    if((mod(sa-da)/2)%2==1){
        if(mod(sb-db)%2==0){
            cout<<"Impossible\n";
            return 0;
        }
    }
    else{
        if(mod(sb-db)%2==1){
            cout<<"Impossible\n";
            return 0;
        }
    }
    int ja = mod(sa-da);
    int jb = mod(sb-db);
    vector<int> v;
    //UL=1, UR=2, R=3, LR=4, LL=5, L=6
    while((sa!=da) || (sb!=db)){
        if(sa>da){
            if(sb<db){
               v.push_back(2);
                sa-=2;
                sb++;
            }
            else{
                v.push_back(1);
                sa-=2;
                sb--;
            }
        }
        else if(sa<da){
            if(sb<db){
                v.push_back(4);
                sb++;
                sa+=2;
            }
            else {
                v.push_back(5);
                sb--;
                sa+=2;
            }
        }
        else{
            if(sb<db){
                v.push_back(3);
                sb+=2;
            }
            else{
                v.push_back(6);
                sb-=2;
            }
        }
    }
    sort(v.begin(),v.end());
    n = v.size();
    cout<<n<<endl;
    for(i=0;i<n;i++){
        switch(v[i]){
            case 1: cout<<"UL ";break;
            case 2: cout<<"UR ";break;
            case 3: cout<<"R " ;break;
            case 4: cout<<"LR ";break;
            case 5: cout<<"LL ";break;
            case 6: cout<<"L ";break;
        }
    }
    return 0;
}