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 hand is holding an iced doughnut with sprinkles'. Reverse all words of length '1' in the given sentence.
Example Output: a hand is holding an iced doughnut with sprinkles

Example Input: Sentence: 'one person watches while the other flies a kite'. Reverse all words of length '7' in the given sentence.
Example Output: one person sehctaw while the other flies a kite

Example Input: Sentence: 'a girl biting into a graham cracker treat and looking up at the camera'. Reverse all words of length '6' in the given sentence.
Example Output:
a girl gnitib into a maharg cracker treat and looking up at the aremac