#include <bits/stdc++.h>
using namespace std;
int main(){
  vector<char> C(14);
  for (int i = 0; i < 14; i++){
    cin >> C[i];
  }
  int ans = 0;
  int cons = 0;
  for (int i = 0; i < 14; i++){
    if (C[i] == 'o'){
      cons++;
      ans = max(ans, cons);
    } else {
      cons = 0;
    }
  }
  cout << ans << endl;
}