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 river filled with lots of boats and surrounded by buildings'. Reverse all words of length '4' in the given sentence.

Output: a river filled htiw stol of boats and surrounded by buildings


Input: Consider Input: Sentence: 'a snowy hill with a tree lined area'. Reverse all words of length '4' in the given sentence.

Output: a snowy llih htiw a eert lined aera


Input: Consider Input: Sentence: 'there is a stuffed bear in a microwave'. Reverse all words of length '7' in the given sentence.


Output: there is a deffuts bear in a microwave