#include<iostream>
#include<string>
#include<algorithm>

using namespace std;

int main()
{
	string s;
	cin>>s;
	string target="leadinguniversity";
	sort(s.begin(),s.end());
	sort(target.begin(),target.end());
	if(s==target)
	{
		cout<<"Leading University"<<endl;
	}
	else
	{
		cout<<"Impossible"<<endl;
	}
}