import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int count = 0;
        int max = 0;
        for (char c : (sc.next() + sc.next()).toCharArray()) {
            if (c == 'o') {
                count++;
            } else {
                count = 0;
            }
            max = Math.max(max, count);
        }
        System.out.println(max);
    }
}