In this task, you need to remove 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 motorcycle covered with a red blanket is parked in the middle of a plaza'. Remove all words of length '3' in the given sentence.
Example Output: a motorcycle covered with a blanket is parked in middle of a plaza

Example Input: Sentence: 'a number of benches at the beach and a boat in the sea'. Remove all words of length '7' in the given sentence.
Example Output: a number of at the beach and a boat in the sea

Example Input: Sentence: 'a surfer is riding a wave in the ocean'. Remove all words of length '6' in the given sentence.
Example Output:
a is a wave in the ocean