#include <iostream>
using namespace std;
int main(){
	string a,b;
	cin>>a;
	cin>>b;
	a+=b;
	int cnt=0,max=0;
	for(int i=0;i<a.size();i++){
		if(a[i]=='x'){
			max=max>cnt?max:cnt;
			cnt=0;
		}
		else if(a[i]=='o')	cnt++;
	}
	max=max>cnt?max:cnt;
	cout<<max<<endl;
	return 0;
}