import java.util.Scanner;

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

		String s = sc.next() + sc.next();
		int cnt = 0, max = 0;
		for(int i = 0; i < s.length(); i++){
			if(s.charAt(i) == 'o'){
				cnt++;
				max = Math.max(max, cnt);
			} else {
				cnt = 0;
			}
		}
		System.out.println(max);
	}
}