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.

[EX Q]: Sentence: 'a boy looks excitedly at his birthday cake with his friend'. Remove all words of length '9' in the given sentence.
[EX A]: a boy looks at his birthday cake with his friend

[EX Q]: Sentence: 'a bear rolling on his back on some logs'. Remove all words of length '2' in the given sentence.
[EX A]: a bear rolling his back some logs

[EX Q]: Sentence: 'three umbrellas with unique designs sitting next to each other'. Remove all words of length '7' in the given sentence.
[EX A]:
three umbrellas with unique next to each other