#include <bits/stdc++.h>   using namespace std;   const int N = 4e5 + 10;   const int inf = 1e9;   int main() {     ios::sync_with_stdio(false);     string s;     cin >> s;     s =     + s;     int i;     int ans = 0;     int sum = 0;     for (i = 1; i < (int)s.size(); i++) {       if (s[i] ==  M ) {         sum++;       }       if (s[i] ==  F  && sum > 0) {         ans = max(ans + 1, sum);       }     }     cout << ans << endl;     return 0;   }   