#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
  #define _GLIBCXX_DEBUG
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  string x, y;
  cin >> x >> y;
  string z = x + y;
  for (int ans = z.size(); ans >= 0; ans--) {
    rep(i, z.size() - ans + 1) {
      string s = z.substr(i, ans);
      string t = "";
      rep(_, ans) t += 'o';
      if (s == t) {
        cout << ans << endl;
        return 0;
      }
    }
  }
  return 0;
}