import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        try (Scanner scan = new Scanner(System.in)) {
            String str = scan.next() + scan.next();
            int max = 0;
            for(int i=0; i<str.length(); i++) {
                if(str.charAt(i) == 'o') {
                    int count = 0;
                    for(int j=i; j<str.length(); j++) {
                        if(str.charAt(j) == 'o') {
                            count++;
                        } else {
                            break;
                        }
                    }
                    max = Math.max(max, count);
                }
            }
            System.out.println(max);
        }
    }
}