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 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: 'pictures a candle a single flower and a stuffed bear on a table'. Reverse all words of length '6' in the given sentence.
Example Output: pictures a eldnac a elgnis rewolf and a stuffed bear on a table

Example Input: Sentence: 'a man is sitting at a bar and using a lap top computer'. Reverse all words of length '8' in the given sentence.
Example Output:
a man is sitting at a bar and using a lap top retupmoc