Definition: 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.
Input: Sentence: 'the man is ready to eat his hotdog and drink his coke'. Reverse all words of length '6' in the given sentence.

the man is ready to eat his godtoh and drink his coke