import java.util.Scanner;
class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int animals = sc.nextInt();
        int legs = sc.nextInt();
        int chicken=(4*animals-legs)/2;
        int rabbit=animals-chicken;
        if(chicken<=0||rabbit<=0||l!=(4*rabbit+2*chicken)){
            System.out.println("Invalid input");
            return;
        }
        System.out.println("Chickens="+chicken+" "+"Rabbits="+rabbit);
    }
}