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 stack of donuts sitting on a piece of paper'. Remove all words of length '7' in the given sentence.
a stack of donuts on a piece of paper

Sentence: 'a group of people at a table in a room'. Remove all words of length '6' in the given sentence.
a group of at a table in a room

Sentence: 'six zebras eating grass of of a dirt road'. Remove all words of length '2' in the given sentence.

six zebras eating grass of a dirt road