#! /usr/bin/env python
import sys
# conversion mappings
_1to9dict = {'0':'', '1':'one', '2':'two', '3':'three', '4':'four',
             '5':'five', '6':'six', '7':'seven', '8':'eight',
             '9':'nine'}
_10to19dict = {'0':'ten', '1':'eleven', '2':'twelve', '3':
               'thirteen', '4':'fourteen', '5':'fifteen', '6':
               'sixteen', '7':'seventeen', '8':'eighteen', 
               '9':'nineteen'}
_20to90dict = {'2':'twenty', '3':'thirty', '4':'forty', '5':'fifty',
               '6':'sixty', '7':'seventy', '8':'eighty', '9':'ninety'}
def num2words(num_string):
    if num_string == '0': 
        return('zero')
    if len(num_string) > 2:  
         return "Sorry can only handle 1 or 2 digit numbers"
    num_string = '0' + num_string         # pad on left in case it’s a single digit number
    tens, ones = num_string[-2], num_string[-1]
    if tens == '0': 
        return _1to9dict[ones]
    elif tens == '1': 
        return _10to19dict[ones]
    else: 
        return _20to90dict[tens] + ' ' +  _1to9dict[ones]
def main():   
    print(num2words(sys.argv[1]))
main()