#include <bits/stdc++.h>

using namespace std;

#define REP(i,n) for(int i=0; i<(int)(n); i++)
#define FOR(i,b,e) for (int i=(int)(b); i<(int)(e); i++)
#define ALL(x) (x).begin(), (x).end()

const double PI = acos(-1);


vector<pair<char, int> > lengthencoding(const string &s) {
  vector<pair<char, int> > ret;
  int i = 0;
  while (i < s.length()) {
    int j = i;
    while (j < s.length() && s[j] == s[i])
      ++j;
    ret.emplace_back(s[i], j-i);
    i = j;
  }
  return ret;
}

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  
  string s1, s2;
  cin >> s1 >> s2;
  int ret = 0;
  for (auto &p: lengthencoding(s1+s2)) {
    if (p.first == 'o')
      ret = max(ret, p.second);
  }
  cout << ret << endl;
  
  return 0;
}