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 man is crouched down by a big elephant'. Remove all words of length '3' in the given sentence.
a is crouched down by a elephant

Sentence: 'a small child on a skate board out doors'. Remove all words of length '5' in the given sentence.
a on a out

Sentence: 'a small fury dog next to a window'. Remove all words of length '6' in the given sentence.

a small fury dog next to a