function solve(){
	class Product {
			var productType;
			var name;
			var price;
	    	constructor(productType, name, price){
	    		this.productType = productType;
	    		this.name = name;
	    		this.price = price;
	    	}

	    	 get name(){
	    		 return this.name;
	    	 }
	    	 get productType(){
	    		 return this.productType;
	    	 }

	    	 get price(){
	    		 return this.price;
	    	 }

	    	 set name(){
	    		 return this.name;
	    	 }
	    	 set productType(productType){
	    		if(typeof productType == "string"){
	    			this.productType = productType;
	    		}else this.productType = '';
	    	 }

	    	 set price(price){
	    		 if(isNAN(price)== true){
	    			 if(price>=0){
	    				 this.price = price;
	    			 }else this.price = 0;

	    		 }
	    	 }





        /* .... */
    }



    class ShoppingCart {
    	var products = [];
    	constructor(){

    	};
    	function add(product){
    		this.products.push(product);
    		}
    	function remove(product){
    		for ( var i = 0; i<this.products.length ;i++) {
				if(this.products.name==product.name){
					if(this.products.productType==product.productType){
						this.products.price==product.price{
							this.product.splice(i,1);
							break;
						}
					}
				}
			}

    	}
        /* .... */
    }
    return {
        Product, ShoppingCart
    };
}