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 with a backpack waiting at a train station'. Remove all words of length '7' in the given sentence.

SOLUTION: a man with a backpack at a train

PROBLEM: Sentence: 'red and white stop sign and a line of gray cars parked along the street'. Remove all words of length '4' in the given sentence.

SOLUTION: red and white and a of parked along the street

PROBLEM: Sentence: 'an old man with three hats on his head sticking his tongue out'. Remove all words of length '4' in the given sentence.

SOLUTION:
an old man three on his sticking his tongue out