import java.util.*;

public class Main {

    public static void main(String[] args) {

        Scanner keyboard = new Scanner(System.in);

        System.out.println("Ye Olde Keychain Shoppe");
        System.out.println();
        while(true){
            System.out.println("1. Add Keychains to Order");
            System.out.println("2. Remove Keychains from Order");
            System.out.println("3. View Current Order");
            System.out.println("4. Checkout");
            System.out.println();
            System.out.println("Please enter your choice: ");
            int keychains = keyboard.nextInt();
            System.out.println();
            if (keychains == 1){
                add_keychains();
                System.out.println();
            } else if (keychains == 2){
                remove_keychains();
                System.out.println();
            } else if (keychains == 3){
                view_order();
                System.out.println();
            } else if (keychains == 4){
                checkout();
                break;
            }
        }

    }

    public static String add_keychains(){
            System.out.println("ADD KEYCHAINS");
            return null;
    }

    public static String remove_keychains(){
            System.out.println("REMOVE KEYCHAINS");
            return null;
    }

    public static String view_order(){
            System.out.println("VIEW ORDER");
            return null;
    }

    public static String checkout(){
            System.out.println("CHECKOUT");
            return null;
    }
}