#include <iostream>
#include <string>
#include <unordered_map>

using namespace std;

int main() {
    string s;
    cin >> s;

    unordered_map<char, int> main; 
    for (char c : s) {
        main[c]++;
    }

    
    if (main['l'] >= 2 && main['e'] >= 2 && main['a'] >= 1 &&
        main['d'] >= 1 && main['i'] >= 2 && main['n'] >= 2 &&
        main['g'] >= 1 && main['u'] >= 1 && main['v'] >= 1 &&
        main['r'] >= 1 && main['s'] >= 1 && main['t'] >= 1 &&
        main['y'] >= 1) {
        cout << "Leading University" << endl;
    }
    else {
        cout << "Impossible" << endl;
    }

    return 0;
}