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 child sits on a chair next to a bear'. Reverse all words of length '5' in the given sentence.
a dlihc sits on a riahc next to a bear

Sentence: 'there are many animals standing on the top of this mountain'. Reverse all words of length '4' in the given sentence.
there are ynam animals standing on the top of siht mountain

Sentence: 'the cell phone is in front of a computer monitor'. Reverse all words of length '1' in the given sentence.

the cell phone is in front of a computer monitor