#include <iostream>
#include <fstream>
#include <vector>
#include <string>
#include <algorithm>
using namespace std;

int main(){


  string c,c1,c2; cin >> c1 >>c2;
  c = c1 + c2;
  vector<int> v(14);
  int n = 14;
  int ans = 0;
  int t = 0;
  for (int i = 0; i < n - 1; i++) {
    if (c[i] == c[i + 1] && c[i] == 'o') {
      ans++;
      v[i] = ans;
    }else{
      ans = 0;
    }
  }
  int max = *max_element(v.begin(),v.end());
  for (int i = 0; i < 14; i++) {
    if (c[i] == 'x') {
      t++;
    }
  }
  if (t == 14) {
    cout << 0 << "\n";
  }else{
    cout << max + 1 << "\n";
  }
  return 0;
}