#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;
}