#include <bits/stdc++.h>
#define rep(i, a, n) for (int i = a; i < n; i++)
#define repr(i, a, n) for (int i = n - 1; i >= a; i--)
using namespace std;
using ll = long long;
using P = pair<int, int>;
template <typename T> void chmin(T &a, T b) { a = min(a, b); }
template <typename T> void chmax(T &a, T b) { a = max(a, b); }

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);

  string c1, c2;
  cin >> c1 >> c2;
  string c3 = c1 + c2 + "x";

  int ans = 0, cnt = 0;
  ;
  rep(i, 0, c3.size()) {
    if (c3[i] == 'o')
      cnt++;
    else {
      chmax(ans, cnt);
      cnt = 0;
    }
  }

  cout << ans << endl;
}