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 traffic light with road instructions directs traffic'. Reverse all words of length '4' in the given sentence.
Example Output: a traffic light htiw daor instructions directs traffic

Example Input: Sentence: 'an orange and white bus driving down a city street'. Reverse all words of length '1' in the given sentence.
Example Output: an orange and white bus driving down a city street

Example Input: Sentence: 'a grapefruit and four oranges in a bowl'. Reverse all words of length '7' in the given sentence.
Example Output:
a grapefruit and four segnaro in a bowl