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

int main() {
  string S = "";
  for(int i = 0; i < 2; i++){
    string T; cin >> T;
    S += T;
  }
  int now = 0, maxQ = 0;
  for(int i = 0; i < 14; i++){
    if(S[i] == 'o'){
      now++;
      maxQ = max(maxQ, now);
    }else{
      now = 0;
    }
  }
  cout << maxQ << endl;
}