public class countx{

    public static void main(String[] argv){
        System.out.println(countX("xxhixx"));
        System.out.println(countX("xhixhix"));
    }

    public static int countX(String str) {
        if(str.length()==1){
            if(str.equals("x"))
                return 1;
            else
                return 0;
        }else if(str.length()>1){
            if(str.charAt(0)=='x')
                return 1+countX(str.substring(1));
            else
                return countX(str.substring(1));
        }else{
            return 0;
        }
    }
}