package yukicoder150508;
import java.util.Scanner;


public class Main {

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

		String c = sc.next() + sc.next();

		int count = 0;
		int max = 0;
		for (int i = 0; i < c.length(); i++) {
			if (c.charAt(i) == 'o') {
				count++;
				max = Math.max(max, count);
			} else {
				count = 0;
			}
		}

		System.out.println(max);

		sc.close();
	}
}