
_UpperCAmelCase   :					Union[str, Any]    =			{
    "+": lambda x, y: x + y,
    "-": lambda x, y: x - y,
    "*": lambda x, y: x * y,
    "/": lambda x, y: x / y,
}


def  A			(   lowercase					)  ->    Any:
		'''simple docstring'''

		return c.isdigit()


def  A			(   lowercase					)  ->    int:
		'''simple docstring'''

		UpperCamelCase            =	[]

		# iterate over the string in reverse order
		for c in expression.split()[::-1]:
				# push operand to stack
				if is_operand(lowercase					):
						stack.append(int(lowercase					)					)

				else:
						# pop values from stack can calculate the result
						# push the result onto the stack again
						UpperCamelCase            =	stack.pop()
						UpperCamelCase            =	stack.pop()
						stack.append(calc[c](lowercase       ,			lowercase					)					)

		return stack.pop()


# Driver code
if __name__ == "__main__":
					_UpperCAmelCase   :					List[str]    =			"+ 9 * 2 6"
					print(evaluate(test_expression))

					_UpperCAmelCase   :					Optional[int]    =			"/ * 10 2 + 4 1 "
					print(evaluate(test_expression))


def  A			(   lowercase					)  ->    int:
		'''simple docstring'''

		barcode //= 10  # exclude the last digit
		UpperCamelCase            =	False
		UpperCamelCase            =	0

		# extract and check each digit
		while barcode != 0:
				UpperCamelCase            =	1 if checker else 3
				s += mult * (barcode % 10)
				barcode //= 10
				UpperCamelCase            =	not checker

		return (10 - (s % 10)) % 10


def  A			(   lowercase					)  ->    bool:
		'''simple docstring'''

		return len(str(lowercase					)					) == 13 and get_check_digit(lowercase					) == barcode % 10


def  A			(   lowercase					)  ->    int:
		'''simple docstring'''

		if str(lowercase					).isalpha():
				UpperCamelCase            =	f'''Barcode \'{barcode}\' has alphabetic characters.'''
				raise ValueError(lowercase					)
		elif int(lowercase					) < 0:
				raise ValueError('The entered barcode has a negative value. Try again.'					)
		else:
				return int(lowercase					)


if __name__ == "__main__":
					import doctest

					doctest.testmod()
					_UpperCAmelCase   :					List[str]    =			get_barcode(input("Barcode: ").strip())

					if is_valid(barcode):
										print(F'''\'{barcode}\' is a valid barcode.''')
					else:
										print(F'''\'{barcode}\' is NOT a valid barcode.''')
