Ask a small girl - "How old are you?". She always says strange things... Lets help her!
For correct answer program should return int from 0 to 9.
Assume test input string always valid and may look like 
"1 year old" or "5 years old", etc.. The first char is number only.
get_age = lambda s: ord(s[0])-ord('0')
get_age = lambda s: ord(s[0])-ord('0')