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 on a surfboard in the ocean riding a wave as the water crashes behind him'. Remove all words of length '1' in the given sentence.

man on surfboard in the ocean riding wave as the water crashes behind him