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.

Example Input: Sentence: 'a man that is sitting in a field with a phone'. Reverse all words of length '4' in the given sentence.
Example Output: a man taht is sitting in a field htiw a phone

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

Example Input: Sentence: 'a woman is looking at ribbon for children participating in an art activity'. Reverse all words of length '2' in the given sentence.
Example Output:
a woman si looking ta ribbon for children participating ni na art activity