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

    if (str == target) {
        cout << "Leading University" << endl;
    } else {
        cout << "Impossible" << endl;
    }
    return 0;
}