import java.util.Scanner;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;

class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);

        int count = 0;
        int ans = 0;

        for(int i=0; i<2; i++) {
            String s1 = in.next();
            char[] c1 = s1.toCharArray();
            for(int k=0; k<s1.length(); k++) {
                if(c1[k] == 'o') {
                    count++;
                    ans = Math.max(ans, count);
                } else {
                    count = 0;
                }
            }
        }

        System.out.println(ans);

        in.close();
    }
}