import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String[] s = new String[14];
		String s1 = sc.next() + sc.next();
		for(int i = 0 ; i < 14 ; i++) s[i] = "" + s1.charAt(i);
		int ans = -1001001001;
		for(int i = 0 ; i < 14 ; i++) {
			if(s[i].equals("o")) {
				for(int j = i + 1 ; j < 14 ; j++) {
					if(s[j].equals("o")) {
						ans = Math.max(ans, j - i + 1);
					} else {
						break;
					}
				}
			}
		}
		if(ans == -1001001001) {
			System.out.println(0);
		} else {
			System.out.println(ans);
		}
 	}
}