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);
        String week1 = in.next();
        String week2 = in.next();

        String gWeek = week1 + week2;
        int count = 0;
        int max = 0;

        for(int i=0; i<14; i++) {
            if(gWeek.charAt(i) == 'o') {
                count++;
                if(i == 13) {
                    if (count > max) max = count;
                }
            } else {
                if(count > max) {
                    max = count;
                } else {
                    count = 0;
                }
            }
        }

        System.out.println(max);

        in.close();
    }
}