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 grey cat with green eyes looking straight ahead'. Reverse all words of length '1' in the given sentence.
Example Output: a grey cat with green eyes looking straight ahead

Example Input: Sentence: 'a heard of animals in a field approaching the water'. Reverse all words of length '11' in the given sentence.
Example Output: a heard of animals in a field gnihcaorppa the water

Example Input: Sentence: 'two benches on a platform near a wooded area'. Reverse all words of length '4' in the given sentence.
Example Output:
two benches on a platform raen a wooded aera