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 street pole with some signs sitting on top of it'. Reverse all words of length '6' in the given sentence.
a teerts pole with some signs sitting on top of it

Sentence: 'a couple of beds pushed together inside of a hospital'. Reverse all words of length '6' in the given sentence.
a elpuoc of beds dehsup together edisni of a hospital

Sentence: 'a person in bear feet standing on a skateboard'. Reverse all words of length '4' in the given sentence.

a person in raeb teef standing on a skateboard