#include <iostream>
#include <iomanip>

#include <algorithm>
#include <math.h>

#include <string>
#include <list>
/////////
#define REP(i, x, n) for(int i = x; i < n; i++)
#define rep(i,n) REP(i,0,n)
#define P(p) cout<<(p)<<endl;
/////////
typedef long long LL;
typedef long double LD;
/////////
using namespace::std;
/////////

int main(void){
    cin.tie(0);
    ios::sync_with_stdio(false);
    cout << fixed;//
    //cout << setprecision(6);//

	string s1,s2,s;
	cin>>s1>>s2;
	s = s1 + s2;

	int max = 0;
	int count = 0;
	rep(i,s.size()){
		if(s[i] == 'o'){
			++count;
			if(count > max){
				max = count;
			}
		}else{
			count = 0;
		}
	}
	P(max);
    return 0;
}