import java.util.*;

class Ideone{
    public static void main (String[] args) throws java.lang.Exception
    {
        Scanner koko = new Scanner(System.in);
        String one = koko.next();
        String two = koko.next();
        String whole = one + two;
        if(whole.equals("xxxxxxxxxxxxxx")){
        	System.out.println(0);
        }else{
        	String[] who = whole.split("x");
            int[] week = new int[who.length];
            for(int i=0; i<who.length; i++){
                week[i]=who[i].length();
            }
            Arrays.sort(week);
            System.out.println(week[who.length-1]);
        }
        
    }
}