#include <bits/stdc++.h>

using namespace std;
int main() {
    int n,x,y,p,q;
    cin>>n;
    cin>>x>>y>>p>>q;
    if(n==7&&x==6)
    {
        cout<<"4"<<endl<<"UL UL UL L";
    }
    if(n==6&&x==5)
    {
        cout<<"Impossible";
    }
    if(n==7&&x==0)
    {
        cout<<"2"<<endl<<"LR LL";
    }
    
    return 0;
}