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.

Sentence: 'a surfer is leaving the water with his board as the waves roll in'. Remove all words of length '4' in the given sentence.
a surfer is leaving the water his board as the waves in

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

Sentence: 'people on a barge paddling down the river'. Remove all words of length '1' in the given sentence.

people on barge paddling down the river