import java.util.Scanner;

public class No203 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String[] w1 = sc.nextLine().split("", 0);
        String[] w2 = sc.nextLine().split("", 0);
        String[] w = new String[w1.length + w2.length];
        System.arraycopy(w1, 0, w, 0, w1.length);
        System.arraycopy(w2, 0, w, w1.length, w2.length);
        int count = 0;
        int max = 0;
        for(int i = 0; i < w.length; i++) {
            if("o".equals(w[i])) {
                count++;
            }
            else {
                if(count > max) {
                    max = count;
                }
                count = 0;
            }
        }
        System.out.println(max > count ? max : count);
    }
}