#define _USE_MATH_DEFINES	//M_PI(π),M_SQRT2(√2)
#include <iostream>			//std::cout, std::cin
#include <string>			//std::string
#include <vector>			//std::vector
#include <valarray>			//std::valarray
#include <algorithm>		//std::sort
#include <time.h>			//localtime_s
#include <cstdlib>			//abs
#include <cmath>			//abs,std::pow,sqrt,sin,cos,round,floor,ceil
#include <fstream>			//std::ifstream
#include <iomanip>			//std::setprecision,std::setw,std::setfill
#include <random>			//std::random(C++11)
#include <numeric>			//std::accumulate

int main(void) {

	//test用
	//std::ifstream in("test.txt");
	//std::cin.rdbuf(in.rdbuf());

	//const unsigned int MODULO = 1000000007;	//MODULO 10^9+7用

	std::string str, C;
	std::cin >> str;
	C += str;
	std::cin >> str;
	C += str;

	int max = 0, temp = 0;
	bool flg = false;

	for (int i = 0; i < C.length(); i++) {
		if (C[i] == 'x') {
			if (flg) {
				flg = false;
				if (temp >= max) {
					max = temp;
				}
				temp = 0;
			}
		}
		else {
			flg = true;
			temp++;
		}
	}

	if (temp != 0) {
		if (temp >= max) {
			max = temp;
		}
	}
	std::cout << max << std::endl;

}