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 man sitting in a boat with a tv'. Reverse all words of length '7' in the given sentence.
a man gnittis in a boat with a tv

Sentence: 'a person is on the court and playing tennis'. Reverse all words of length '3' in the given sentence.
a person is on eht court dna playing tennis

Sentence: 'the blonde lady answered her cell phone because she was waiting for an important call'. Reverse all words of length '7' in the given sentence.

the blonde lady answered her cell phone esuaceb she was gnitiaw for an important call