#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, p = 0, q = 0;
  cin >> n;
  string str;
  cin >> str;
  for (int i = 0; i < n; i++) {
    if (str[i] == 'F' && str[i + 1] == 'S') p = p + 1;
    if (str[i] == 'S' && str[i + 1] == 'F') q = q + 1;
  }
  if (q > p)
    cout << "YES";
  else
    cout << "NO";
}
