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 brown bear is standing at the base of the tree'. Remove all words of length '3' in the given sentence.
Example Output: a brown bear is standing at base of tree

Example Input: Sentence: 'a person throwing a frisbee in a field of grass and straw'. Remove all words of length '6' in the given sentence.
Example Output: a throwing a frisbee in a field of grass and straw

Example Input: Sentence: 'the helen j sitting in the ocean not moving'. Remove all words of length '5' in the given sentence.
Example Output:
the j sitting in the not moving