text: #include <bits/stdc++.h>
  
  using namespace std;
  
  int main() {
    int n;
    cin >> n;
  
    for (int i = 0; i < n; i++) {
      char c;
      cin >> c;
  
      if (c == 'Y') {
        cout << "Four" << endl;
        return 0;
      }
    }
  
    cout << "Three" << endl;
  }
  