package no203;

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		char[] c = new char[14];
		for(int i=0;i<2;i++) {
			char[] s = sc.next().toCharArray();
			for(int j=0;j<7;j++) {
				c[i*7+j] = s[j];
			}
		}
		int max = 0;
		int now = 0;
		for(int i=0;i<14;i++) {
			if (c[i] == 'o') {
				now++;
				max = Math.max(max, now);
			}else{
				now = 0;
			}
		}
		System.out.println(max);
	}

}