#include <iostream>
#include <string>
#include <algorithm>
using namespace std;

int main() {
  string s, t;
  int ans = 0, cnt = 0;
  cin >> s >> t;
  s += t;
  for (auto& e : s) {
    if (e == 'o') {
      cnt++;
      ans = max(ans, cnt);
    } else {
      cnt = 0;
    }
  }
  cout << ans << endl;
}