In this task, you need to reverse all words of a given length in the sentence. The number of letters in a word determine its length. For example, the length of the word "apple" is 5.

Input: Consider Input: Sentence: 'a couple of trains are sitting on some tracks'. Reverse all words of length '2' in the given sentence.

Output: a couple fo trains are sitting no some tracks


Input: Consider Input: Sentence: 'a woman is riding a show horse at a competition'. Reverse all words of length '6' in the given sentence.

Output: a woman is gnidir a show horse at a competition


Input: Consider Input: Sentence: 'a couple of sheep standing on top of dry grass'. Reverse all words of length '5' in the given sentence.


Output: a couple of peehs standing on top of dry ssarg