import java.util.Arrays;
import java.util.LinkedList;
import java.util.Scanner;

public class Main {
	
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		
		final char[] days = (sc.next() + sc.next()).toCharArray();
		
		int count = 0, max = 0;
		for(char c : days){
			if(c == 'o'){
				count++;
			}else{
				max = Math.max(max, count);
				count = 0;
			}
		}
		max = Math.max(max, count);
		
		System.out.println(max);
		
	}
	
}