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

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