import java.util.Scanner;

public class Main {

    public static void main(String[] argv) {
        Scanner scanner = new Scanner(System.in);
        String s = scanner.next();
        s += scanner.next();
        int count = 0;
        int res = 0;
        for (int i = 0; i < 14; i++) {
            if (s.charAt(i) == 'o') {
                count++;
                res = Math.max(res, count);
            } else {
                count = 0;
            }
        }
        System.out.println(res);
    }
}