Definition: 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.
Input: Sentence: 'a man and his dog out in the water at the beach with the dog standing on a surfboard'. Remove all words of length '3' in the given sentence.

a in water at beach with standing on a surfboard