Funny OR Not

Ram was playing with strings and he invented a funny string. The rule he made to determine whether a string is funny or not is to create a copy of the string in reverse e.g. $abc->cba$ . Iterating through each string, compare the absolute difference in the ascii values of the characters at positions 0 and 1, 1 and 2 and so on to the end. If the list of absolute differences is the same for both str