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 small bird is on top of a branch'. Remove all words of length '6' in the given sentence.
a small bird is on top of a

Sentence: 'a sign post with an eagle on the top in a marshy park area'. Remove all words of length '6' in the given sentence.
a sign post with an eagle on the top in a park area

Sentence: 'an elephant stands in an enclosure near a fence'. Remove all words of length '6' in the given sentence.

an elephant in an enclosure near a fence