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 large airplane flies in blue skies over some pretty trees'. Remove all words of length '6' in the given sentence.
a large airplane flies in blue skies over some trees

Sentence: 'there are people flying kites high in the sky'. Remove all words of length '4' in the given sentence.
there are people flying kites in the sky

Sentence: 'a car that is sitting at a red light'. Remove all words of length '4' in the given sentence.

a car is sitting at a red light