import java.util.*;
public class gw{
	public static void main(String... args){
		Scanner scan = new Scanner(System.in);
		String str1 = scan.next();
		String str2 = scan.next();
		System.out.println(calc(str1+str2));
	}
	public static int calc(String str){
		int[] counter = new int[14];
		for(int i = 0; i < counter.length;i++){
			counter[i] = 0;
		}
		String[] h = str.split("x",0);
		int max = 0;
		for(int i = 0;i<h.length;i++){
			if(h[i].length() > max){
				max = h[i].length();
			}
		}
		return max;
	}
}