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.

Ex Input:
Sentence: 'a guy on  a surf board by a very big wave'. Reverse all words of length '3' in the given sentence.

Ex Output:
a yug on a surf board by a very gib wave


Ex Input:
Sentence: 'a messy bedroom with items covering the floor'. Reverse all words of length '8' in the given sentence.

Ex Output:
a messy bedroom with items gnirevoc the floor


Ex Input:
Sentence: 'a long red train is coming down some tracks'. Reverse all words of length '2' in the given sentence.

Ex Output:

a long red train si coming down some tracks