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: 'two birds sitting on a large rock next to a river'. Remove all words of length '5' in the given sentence.
Example Output: two sitting on a rock next to a

Example Input: Sentence: 'a person on a surfboard in the water'. Remove all words of length '6' in the given sentence.
Example Output: a on a surfboard in the water

Example Input: Sentence: 'people gather together on the beach to fly kites'. Remove all words of length '3' in the given sentence.
Example Output:
people gather together on beach to kites