#Write a function called word$\_$count. word$\_$count takes as

#input a string called my$\_$string, and returns as output the

#number of words in the string. For the purposes of this

#problem, you can assume that every space indicates a new

#word; so$,$ the number of words should be one more than the

#number of spaces. You may also assume that any strings are

#not empty, so there should always be at least one word if

#my$\_$string is a string.

#

#Note, though, that it could be the case that a non$-$string

#is accidentally passed in as the argument for my$\_$string. If

#that happens, an error will arise. If such an error arises,

#you should instead return "Not a string". Otherwise,

#return an integer representing the number of words in the

#string.