import java.util.*;

public class Main {
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		String s = "";
		for (int i=0; i<2; i++) {
			s += sc.nextLine();
		}
		
		int count = 0;
		int max = 0;
		for (int i=0; i<s.length(); i++) {
			if (s.charAt(i)=='o') {
				count++;
				max = Math.max(max,count);
			}
			else {count = 0;}
		}
		
		System.out.println(max);
	}
}