#include <iostream>
#include <string>
#include <algorithm>
using namespace std;

int main(){
    string s, p;
    p = "leadinguniversity";

    cin >> s;
    sort(s.begin(), s.end());
    sort(p.begin(), p.end());
    
    if(s == p){
        cout << "Leading University";
    }else{
        cout << "Impossible";
    }

    return 0;
}