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.

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

Sentence: 'a dog standing on top of a dirt field next to a frisbee'. Reverse all words of length '4' in the given sentence.
a dog standing on top of a trid field txen to a frisbee

Sentence: 'two baseball players one is in the batters box and has his bat back and the other one is standing on the sidelines along with fans in seats watching'. Reverse all words of length '5' in the given sentence.

two baseball players one is in the batters box and has his bat back and the rehto one is standing on the sidelines gnola with fans in staes watching