#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint1000000007;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000000000000
	

int main(){	
	
	string s,t;
	cin>>s>>t;
	s += t;
	
	int ans = 0;
	rep(i,s.size()){
		for(int j=1;j<=30;j++){
			if(s.substr(i,j)==string(j,'o'))ans = max(ans,j);
		}
	}
	
	cout<<ans<<endl;
	
	return 0;
	
}