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 woman sitting with two dressed up teddy bears'. Remove all words of length '4' in the given sentence.
a woman sitting two dressed up teddy bears

Sentence: 'people riding an elephant down a shady trail'. Remove all words of length '5' in the given sentence.
people riding an elephant down a

Sentence: 'a couple of giraffe standing on top of a grass covered field'. Remove all words of length '6' in the given sentence.

a of giraffe standing on top of a grass covered field