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 walking down a street while talking on a cell phone'. Remove all words of length '3' in the given sentence.
a walking down a street while talking on a cell phone

Sentence: 'giraffe standing in the shade of a tall covering'. Remove all words of length '3' in the given sentence.
giraffe standing in shade of a tall covering

Sentence: 'a picture of a scene of an airport'. Remove all words of length '2' in the given sentence.

a picture a scene airport