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

int main() {
  string S, T;
  cin >> S >> T;
  S += T + 'x';

  int cnt = 0, ans = 0;
  for (int i = 0; i < S.size(); i++) {
    if (S.at(i) == 'o') cnt++;
    else {
      ans = max(ans, cnt);
      cnt = 0;
    }
  }

  cout << ans << "\n";
}