class Book:
    def __init__(self, id, name, shabak, author, price):
        self.id = id
        self.name = name
        self.shabak = shabak
        self.author = author
        self.price = price
  
    def Read_info(self):
        self.id = int(input("enter book id: "))   # casting
        self.name = input("enter book name: ")
        self.shabak = input("enter book shabak(ISBN): ")
        self.author = input("enter book author: ")
        self.price = int(input("enter book price: "))
        return self

    def show_info(self):
        print(self.id, " , ", self.name, " , ", self.shabak, " , ", self.author, " , ", self.price)

    def __lt__(self , other):
        if( self.price<other.price):
            return True
        else:
            return False
   

list_book = []
for i in range(0, 3):
    book = Book(0, "", "", "", 0)
    book.Read_info()
    list_book.append(book)
for i in range(3):
        for j in range(3):
            if( list_book[i]< list_book[j]):
                temp = list_book[i]
                list_book[i] = list_book[j]
                list_book[j] = temp

for i in range(0, 3):
    list_book[i].show_info()