/**
*	author: shafi
*	created: 06.03.2024 16.54.05
**/
#include "bits/stdc++.h"
using namespace std;
#define ll long long int
#define ull unsigned long long int

int main(){
    ios :: sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);

 
        string str;
        cin>>str;
        string tmp = "leadinguniversity";
        sort(tmp.begin(),tmp.end());
        sort(str.begin(),str.end());
        if(str == tmp) cout<<"Leading University\n";
        else cout<<"Impossible\n";
    return 0;
}