Create a function that accepts a string as an argument. Find its shortest word(s) and return them as a list sorted alphabetically (if there are multiple shortest words).
find_shortest_words("I think the solution is fairly obvious.") ➞ ["i"]
find_shortest_words("Chase two rabbits, catch none.") ➞ ["two"]
find_shortest_words("We become what we think about.") ➞ ["we", "we"]
find_shortest_words("The quick brown fox jumped over the lazy dogs back.") ➞ ["fox", "the", "the"]