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 boy and girl sitting on top of a skateboard'. Remove all words of length '2' in the given sentence.
a boy and girl sitting top a skateboard

Sentence: 'a neon motion light on a black surface'. Remove all words of length '6' in the given sentence.
a neon light on a black surface

Sentence: 'a white bear sleep in the woods on a rock'. Remove all words of length '5' in the given sentence.

a bear in the on a rock