#include <iostream>		//cin, cout
#include <vector>		//vector
#include <algorithm>	//sort,min,max,count
#include <string>		//string,getline, to_string
#include <cstdlib>		//abs(int)
#include <utility>		//swap, pair
#include <deque>		//deque
#include <climits>		//INT_MAX
#include <bitset>		//bitset
#include <cmath>		//sqrt, ceil. M_PI, pow, sin
#include <ios>			//fixed
#include <iomanip>		//setprecision

using namespace std;

int main() {

	string a, b;
	cin >> a >> b;

	string S = a + b;

	int ans = 0;
	int temp = 0;
	bool flg = false;

	for (int i = 0; i < 14; i++) {
		if (S[i] == 'o') {
			if (flg) {
				temp++;
			}
			else {
				flg = true;
				temp = 1;
			}
		}
		else {
			if (flg) {
				flg = false;
				if (temp > ans) {
					ans = temp;
				}
			}
		}
	}

	if (temp > ans) {
		ans = temp;
	}

	cout << ans << endl;

	return 0;

}