FIRST_TEN = ["one", "two", "three", "four", "five", "six", "seven", "eight", "nine"]

SECOND_TEN = ["ten", "eleven", "twelve", "thirteen", "fourteen",

"fifteen", "sixteen", "seventeen", "eighteen", "nineteen"]

OTHER_TENS = ["twenty", "thirty", "forty", "fifty",

"sixty", "seventy", "eighty", "ninety"]

HUNDRED = "hundred"

THOUSAND = "thousand"

def tell_number(number):

if number == 0:

return "zero"

elif number < 0:

return "minus " + tell_number(-number)

elif number < 10:

return FIRST_TEN[number - 1]

elif number < 20:

return SECOND_TEN[number - 10]

elif number < 100:

a = number // 10

b = number % 10

if b == 0:

return OTHER_TENS[a - 2]

else:

return OTHER_TENS[a - 2] + " " + tell_number(b)

elif number < 1000:

a = number // 100

b = number % 100

if b == 0:

return tell_number(a) + " " + HUNDRED

else:

return tell_number(a) + " " + HUNDRED + " " + tell_number(b)

else:

a = number // 1000

b = number % 1000

if b == 0:

return tell_number(a) + " " + THOUSAND

else:

return tell_number(a) + " " + THOUSAND + " " + tell_number(b)

if __name__ == '__main__':

# These "asserts" using only for self-checking and not necessary for auto-testing

# Rank 1

assert tell_number(4) == 'four', "1st example"

assert tell_number(133) == 'one hundred thirty three', "2nd example"

assert tell_number(12) == 'twelve', "3rd example"

assert tell_number(101) == 'one hundred one', "4th example"

assert tell_number(212) == 'two hundred twelve', "5th example"

assert tell_number(40) == 'forty', "6th example"

assert not tell_number(212).endswith(' '), "Dont forget strip whitespaces at the end of string"

# Rank 2

assert tell_number(-133) == 'minus one hundred thirty three', "Minus"

assert tell_number(0) == 'zero', "Zero"

# Rank 3

assert tell_number(42000) == 'forty two thousand', "42 many"

assert (tell_number(-999999) ==

"minus nine hundred ninety nine thousand nine hundred ninety nine"), "Abyss"

print("Earn cool rewards by using the 'Check' button!")