public class No_203 {
	//休日の数を数える
	static int holiday(StringBuffer w, int c) {
		c++;
		if (c >= w.length() || !(w.charAt(c) == 'o')) {
			return c;
		}
		return holiday(w, c);
	}

	//平日の数を数える
	static int weekday(StringBuffer w, int c) {
		c++;
		if (c >= w.length() || !(w.charAt(c) == 'x')) {
			return c;
		}
		return weekday(w, c);
	}

	public static void main(String[] args) {
		java.util.Scanner sc = new java.util.Scanner(System.in);
		String s = sc.next() + sc.next();
		StringBuffer week = new StringBuffer(s);
		int count = 0, max = 0;

		while (!week.toString().isEmpty()) {//文字列が無くなったら終わり
			if (week.charAt(0) == 'o') {
				count = holiday(week, 0);
				week.delete(0, count);//count分削除
				max = Math.max(max, count);
			} else {
				count = weekday(week, 0);
				week.delete(0, count);//count分削除
			}
		}
		System.out.println(max);
		sc.close();

	}

}