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

int main() {
 int N;
cin>>N;
string s;
for(int i=0 ; i<N ; i++ ){
cin>>s;
if(s=="Y"){
cout<<"Four"<<endl;
break;
}
if(i==N-1){
cout<<"Three"<<endl;
}
}
}