#include <bits/stdc++.h>

using namespace std;

int main()
{
  string S, T;
  cin >> S;
  cin >> T;

  S += T;

  int ret = 0, sum = 0;
  for(char& c : S) {
    if(c == 'x') sum = 0;
    else ++sum;
    ret = max(ret, sum);
  }
  
  cout << ret << endl;
}