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

using namespace std;

bool canFormLeadingUniversity(const string& s) {
    
    string requiredLetters = "leadinguniversity";

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

    
    for (char letter : requiredLetters) {
        if (letterCount[letter] == 0) {
            return false;
        }
    }

    return true;
}

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

    if (canFormLeadingUniversity(s)) {
        cout << "Leading University" << endl;
    } else {
        cout << "Impossible" << endl;
    }

    return 0;
}