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 small bird sitting on the rim of a fountain'. Reverse all words of length '7' in the given sentence.
Example Output: a small bird gnittis on the rim of a fountain

Example Input: Sentence: 'a guy on  a surf board by a very big wave'. Reverse all words of length '3' in the given sentence.
Example Output: a yug on a surf board by a very gib wave

Example Input: Sentence: 'a guy in action with a volley ball near some trees'. Reverse all words of length '5' in the given sentence.
Example Output:
a guy in action with a volley ball near some seert