#include<iostream>
#include<string>
#include<algorithm>
#include<functional>
#include<vector>
#include<stack>
#include<queue>
#include<set>
#include<map>
#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
using namespace std;

char buf[8], str[15];
int main() {
	cin >> buf;
	strcpy(str, buf);
	cin >> buf;
	strcat(str, buf);

	for(int i = 14; i > 0; i--) {
		char maru[15];
		for(int j = 0; j < i; j++) maru[j] = 'o';
		maru[i] = '\0';
		if(strstr(str, maru) != '\0') {
			cout << i << endl;
			return 0;
		}
	}
	cout << 0 << endl;
	return 0;
}