#include<iostream>
#include<string>

using namespace std;

int main(){

	string in,C;
	int c=0,ans=0;

	cin>>C>>in;
	C+=in;

	for(int i=0;i<C.size()-1;i++){
		if(C[i]=='o'&&C[i+1]=='o') c++;
		else{
			if(c!=0&&c+1>ans) ans=c+1;
			c=0;
		}
	}
	if(c!=0&&c+1>ans) ans=c+1;

	cout<<ans<<endl;
}