#include <bits/stdc++.h>

using namespace std;

int main() {
  string s, t;
  cin >> s >> t;
  s += t;
  int n = s.size();
  int ma = 0;
  int cnt = 0;
  for (int i = 0; i < n; ++i) {
    if (s[i] == 'o') cnt++;
    else {
      ma = max(ma, cnt);
      cnt = 0;
    }
  }
  ma = max(ma, cnt);
  cout << ma << '\n';
  return 0;
}