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 man standing next to a parked car under a street sign'. Reverse all words of length '6' in the given sentence.
Example Output: a man standing next to a dekrap car under a teerts sign

Example Input: Sentence: 'a couple of beds pushed together inside of a hospital'. Reverse all words of length '6' in the given sentence.
Example Output: a elpuoc of beds dehsup together edisni of a hospital

Example Input: Sentence: 'a tall building with a lite up clock in the tower'. Reverse all words of length '3' in the given sentence.
Example Output:
a tall building with a lite up clock in eht tower