






def   SCREAMING_SNAKE_CASE       (				snake_case_      :							str     ):
	return credit_card_number.startswith(("34", "35", "37", "4", "5", "6")     )







def   SCREAMING_SNAKE_CASE       (				snake_case_      :							str     ):
	snake_case__				:   Tuple     =						credit_card_number
	snake_case__				:   int     =						0
	snake_case__				:   Optional[Any]     =						len(snake_case_     ) - 2
	for i in range(snake_case_  ,						-1  ,						-2     ):
		#  double the value of every second digit
		snake_case__				:   str     =						int(cc_number[i]     )
		digit *= 2
		# If doubling of a number results in a two digit number
		# i.e greater than 9(e.g., 6 × 2 = 12),
		# then add the digits of the product (e.g., 12: 1 + 2 = 3, 15: 1 + 5 = 6),
		# to get a single digit number.
		if digit > 9:
			digit %= 10
			digit += 1
		snake_case__				:   Union[str, Any]     =						cc_number[:i] + str(snake_case_     ) + cc_number[i + 1 :]
		total += digit

	# Sum up the remaining digits
	for i in range(len(snake_case_     ) - 1  ,						-1  ,						-2     ):
		total += int(cc_number[i]     )

	return total % 10 == 0







def   SCREAMING_SNAKE_CASE       (				snake_case_      :							str     ):
	snake_case__				:   List[Any]     =						F'''{credit_card_number} is an invalid credit card number because'''
	if not credit_card_number.isdigit():
		print(F'''{error_message} it has nonnumerical characters.'''     )
		return False

	if not 13 <= len(snake_case_     ) <= 16:
		print(F'''{error_message} of its length.'''     )
		return False

	if not validate_initial_digits(snake_case_     ):
		print(F'''{error_message} of its first two digits.'''     )
		return False

	if not luhn_validation(snake_case_     ):
		print(F'''{error_message} it fails the Luhn check.'''     )
		return False

	print(F'''{credit_card_number} is a valid credit card number.'''     )
	return True


if __name__ == "__main__":
	import doctest

	doctest.testmod()
	validate_credit_card_number("""4111111111111111""")
	validate_credit_card_number("""32323""")











def   SCREAMING_SNAKE_CASE       (				snake_case_      :							list     ):
	if len(snake_case_     ) <= 1:
		return lst

	snake_case__				:   List[Any]     =						1

	while i < len(snake_case_     ):
		if lst[i - 1] <= lst[i]:
			i += 1
		else:
			snake_case__,		snake_case__				:   Tuple     =						lst[i], lst[i - 1]
			i -= 1
			if i == 0:
				snake_case__				:   Union[str, Any]     =						1

	return lst


if __name__ == "__main__":
	__lowerCamelCase      :    Dict   		=   input("""Enter numbers separated by a comma:\n""").strip()
	__lowerCamelCase      :    Tuple   		=   [int(item) for item in user_input.split(""",""")]
	print(gnome_sort(unsorted))



