public class No_203 {

	public static void main(String[] args) {
		java.util.Scanner sc = new java.util.Scanner(System.in);
		String s1 = sc.next();
		String s2 = sc.next();
		String week = s1 + s2;
		int holiday = 0;
		int max = 0;

		for (int i = 0; i < week.length(); i++) {
			if (week.charAt(i) == 'o') {
				holiday++;
			} else {
				holiday = 0;
			}
			if (max < holiday) {
				max = holiday;
			}
		}
		System.out.println(max);
		sc.close();

	}

}