package yukicoder203;
import java.util.Scanner;
public class Main {
	public static void main(String[] args){
		Scanner sc=new Scanner(System.in);
		String str1=sc.nextLine();
		String str2=sc.nextLine();
		String str=str1+str2;
		int count=0;
		int max=0;
		for(int i=0;i<str.length();i++){
			if(str.charAt(i)=='o'){
				count++;
				max=Math.max(count, max);
			}else if(str.charAt(i)==('x')){
				max=Math.max(count, max);
				count=0;
			}
		}
		System.out.println(max);
	}
}