#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (n); ++i)

int main(void)
{
  string s, t;
  cin >> s >> t;

  string u = s + t;
  int ch = 0;
  rep(i, u.size())
  {
    if (u[i] == 'o')
    {
      bool flg = true;
      int h = 0;
      while (flg)
      {
        if (u[i] == 'o') h++;
        else flg = false;
        i++;
      }
      ch = max(ch, h);
    }
  }

  cout << ch << endl;
  return 0;
}