/* -*- coding: utf-8 -*-
 *
 * 203.cc: No.203 ゴールデン・ウィーク(1) - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

/* typedef */

/* global variables */

/* subroutines */

/* main */

int main() {
  string w0, w1;
  cin >> w0 >> w1;

  string s = w0 + w1;
  int n = s.size();

  int maxl = 0;
  for (int i = 0; i < n;) {
    if (s[i] == 'o') {
      int j;
      for (j = i; j < n && s[j] == 'o'; j++);
      int l = j - i;
      if (maxl < l) maxl = l;
      i = j;
    }
    else
      i++;
  }

  printf("%d\n", maxl);
  return 0;
}