Given the task definition, example input & output, solve the new input case.
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: Sentence: 'as a guy jumps over the snow with his snowboard people riding on the lift behind him look on'. Reverse all words of length '6' in the given sentence.
Output: as a guy jumps over the snow with his snowboard elpoep gnidir on the lift dniheb him look on
Words 'people', 'riding', 'behind' are of length 6. Reversing these words results in 'elpoep', 'gnidir', and 'dniheb' respectively. So this is a correct answer.

New input case for you: Sentence: 'people are doing something at this time that is bolting'. Reverse all words of length '3' in the given sentence.
Output:
people era doing something at this time that is bolting