Just a small python script about 0-999 converting to words

Stephen's speech module is broken. This module is responsible for his number pronunciation. He has to click to input all of the numerical digits in a figure, so when there are big numbers it can take him a long time. Help the robot to speak properly and faster by writing his speech module. All the words in the string must be separated by exactly one space character.

Input: Integer number from 0 to 999.

Output: A string representation of this number.