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.

[Q]: Sentence: 'a person is walking down the beach holding a surfboard'. Remove all words of length '3' in the given sentence.
[A]: a person is walking down beach holding a surfboard


[Q]: Sentence: 'a bear rolling on his back on some logs'. Remove all words of length '2' in the given sentence.
[A]: a bear rolling his back some logs


[Q]: Sentence: 'a stop sign and a black and white sign and trees'. Remove all words of length '4' in the given sentence.
[A]:
a and a black and white and trees