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 child on bench sticking out her tongue'. Reverse all words of length '6' in the given sentence.
Example Output: a child on bench sticking out her eugnot

Example Input: Sentence: 'a tall clock tower with a sky background'. Reverse all words of length '10' in the given sentence.
Example Output: a tall clock tower with a sky dnuorgkcab

Example Input: Sentence: 'three people out surfing the waves under a clear sky'. Reverse all words of length '6' in the given sentence.
Example Output:
three elpoep out surfing the waves under a clear sky