#include <iostream>
#include <algorithm>
using namespace std;

int main(){
  string a, b;
  cin >> a >> b;
  string str = a + b + 'x';

  int tmp = 0, result = 0;
  for(int i = 0; i < 15; i++){
    if(str[i] == 'o')
      tmp++;
    else {
      result = max(result, tmp);
      tmp = 0;
    }
  }
  cout << result << endl;
}