TASK 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.
PROBLEM: Sentence: 'a man riding a wave on a surfboard'. Remove all words of length '3' in the given sentence.

SOLUTION: a riding a wave on a surfboard

PROBLEM: Sentence: 'hotel with arched doorway and cat sleeping on step'. Remove all words of length '4' in the given sentence.

SOLUTION: hotel arched doorway and cat sleeping on

PROBLEM: Sentence: 'a very pretty brown horse in a grassy field'. Remove all words of length '6' in the given sentence.

SOLUTION:
a very brown horse in a field