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: 'three planes being serviced at the airport on a sunny day'. Reverse all words of length '2' in the given sentence.
Example Output: three planes being serviced ta the airport no a sunny day

Example Input: Sentence: 'a large bird stands on the ledge of a window'. Reverse all words of length '3' in the given sentence.
Example Output: a large bird stands on eht ledge of a window

Example Input: Sentence: 'this is a picture of snowboarders on a mountain'. Reverse all words of length '8' in the given sentence.
Example Output:
this is a picture of snowboarders on a niatnuom