/**
* 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);
#ifndef ONLINE_JUDGE
freopen("input.txt","r",stdin);
freopen("output.txt","w",stdout);
#endif
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;
}