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 large flock of birds flying over a field next to a  tree'. Remove all words of length '2' in the given sentence.

SOLUTION: a large flock birds flying over a field next a tree

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

SOLUTION: a number of at the beach and a boat in the sea

PROBLEM: Sentence: 'a toilet a tub a mirror and a trash can and towel'. Remove all words of length '1' in the given sentence.

SOLUTION:
toilet tub mirror and trash can and towel