# object oriented programming begins
class Shirt:
    def __init__ (self, shirt_color, shirt_size, shirt_style, shirt_price):
        self.color = shirt_color
        self.size = shirt_size
        self.style = shirt_style
        self.price = shirt_price
    
    def change_price(self, new_price):
        self.price = new_price
    
    def discount(self, discount):
        return self.price * (1 - discount)

def main():
    new_shirt = Shirt('red', 'S', 'short sleeve', 15)
    print(new_shirt.color)
    print(new_shirt.size)
    print(new_shirt.style)
    print(new_shirt.price)

if __name__ == "__main__":
    main()