#include <bits/stdc++.h>
using namespace std;

int main ()
{
	deque<char>dq;
	string s;
	cin>>s;
	copy(s.begin(),s.end(),back_inserter(dq));
	dq.push_front('F');
	copy(dq.begin(),dq.end(),ostream_iterator<char>(cout));
}