import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		String s1 = scan.next();
		String s2 = scan.next();
		scan.close();
		int k = 0;
		int max = 0;
		for(int i = 0; i < 7; i++) {
			char c = s1.charAt(i);
			if(c == 'o') {
				k ++;
			}else {
				k = 0;
			}
			if(max < k) {
				max = k;
			}
		}
		for(int i = 0; i < 7; i++) {
			char c = s2.charAt(i);
			if(c == 'o') {
				k ++;
			}else {
				k = 0;
			}
			if(max < k) {
				max = k;
			}
		}
		System.out.println(max);
	}
}