Create a function that takes a string and returns the reversed string. However there's a few rules to follow in order to make the challenge interesting:
special_reverse_string("Innokodakademija") ➞ "Tibade"
special_reverse_string("UPPER lower") ➞ "REWOL reppu"
special_reverse_string("1 23 456") ➞ "6 54 321"
N/A