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 group of people eating a cake on a table'. Reverse all words of length '6' in the given sentence.
Example Output: a group of elpoep gnitae a cake on a table

Example Input: Sentence: 'a partial close up of a computer keyboard and some electronics'. Reverse all words of length '11' in the given sentence.
Example Output: a partial close up of a computer keyboard and some scinortcele

Example Input: Sentence: 'a family room area without anybody in it'. Reverse all words of length '7' in the given sentence.
Example Output:
a family room area tuohtiw ydobyna in it