def checkio(number):
    toStr = ""
    hasSpecials = False
    numbers = ["zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine"]
    deci = {1: "ten", 2: "twenty", 3: "thirty", 4: "forty", 5: "fifty", 6: "sixty", 7: "seventy", 8: "eighty",
            9: "ninety"}
    specials = {11: "eleven", 12: "twelve", 13: "thirteen", 14: "fourteen", 15: "fifteen", 16: "sixteen",
                17: "seventeen", 18: "eighteen", 19: "nineteen"}
    isHundred = number / 100
    isDeci = (number % 100) / 10
    isNum = ((number % 100) % 10)

    if isHundred >= 1:
        toStr += numbers[isHundred] + " hundred"
    if isDeci == 1 and (isNum != 0):
        if toStr:
            toStr += " "
        toStr += specials[isDeci * 10 + isNum]
        hasSpecials = True
    elif isDeci > 1:
        if toStr:
            toStr += " "
        toStr += str(deci[int(isDeci)])
    if hasSpecials == False and isNum != 0:
        if toStr:
            toStr += " "
        toStr += numbers[isNum]
    return toStr


if __name__ == '__main__':
    assert checkio(4) == 'four', "First"
    assert checkio(133) == 'one hundred thirty three', "Second"
    assert checkio(12) == 'twelve', "Third"
    assert checkio(101) == 'one hundred one', "Fifth"
    assert checkio(212) == 'two hundred twelve', "Sixth"
    assert checkio(40) == 'forty', "Seventh, forty - it is correct"

    print('All ok')