#include <bits/stdc++.h>

#pragma GCC optimize("Ofast")
using namespace std;

void solve(int cs) {
  string t = "leadinguniversity";
  string s;
  cin >> s;
  sort(t.begin(), t.end());sort(s.begin(), s.end());
  cout << (t == s ? "Leading University\n" : "Impossible\n");
}

int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  int tc = 1;
  // cin >> tc;
  for (int cs = 1; cs <= tc; cs++) {
    solve(cs);
  }
  return 0;
}