#include <bits/stdc++.h>
#define int long long 
using namespace std;
using Graph = vector<vector<int>>;

signed main(){
  string S, T;
  cin >> S >> T;
  S += T;
  
  int ans = 0;
  int cnt = 0;
  for( int i = 0; i < S.size(); i++ ){
    if( S.at(i)=='o' ) cnt++;
    else{
      ans = max(ans, cnt);
      cnt = 0;
    }
  }
  ans = max(ans, cnt);
  cout << ans << endl;
}