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 city is busy with traffic today as people wait to board the bus'. Reverse all words of length '6' in the given sentence.

the city is busy with traffic today as elpoep wait to board the bus