#include <iostream>
#include <algorithm>
using namespace std;
int main() {
    
    //SAYED AL MAMUN_LU
    
    string samp;
    cin >> samp;
    string target = "leadinguniversity";
    
    sort(samp.begin(), samp.end());
    sort(target.begin(), target.end());

    
    if (samp == target) {
        cout << "Leading University" << endl;
    }
    else {
        cout << "Impossible" << endl;
    }

    return 0;
}