#include <map>
#include <set>
#include <list>
#include <cmath>
#include <ctime>
#include <deque>
#include <queue>
#include <stack>
#include <string>
#include <bitset>
#include <cstdio>
#include <limits>
#include <vector>
#include <climits>
#include <cstring>
#include <cstdlib>
#include <fstream>
#include <numeric>
#include <sstream>
#include <iostream>
#include <algorithm>
#include <unordered_map>

using namespace std;
int main() {
    string s;
    cin>>s;
    map<char,int>mp,mp1;
    for(int i=0;i<int(s.size());i++)
    {
        mp[s[i]]++;
    }
    string s1="leadinguniversity";
    for(int i=0;i<int(s1.size());i++)
    {
        mp1[s1[i]]++;
    }
    if(mp==mp1)
    {
        cout<<"Leading University"<<endl;
    }
    else
    {
        cout<<"Impossible"<<endl;
    }
    return 0;
}