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.

Example Input: Sentence: 'a boy looks excitedly at his birthday cake with his friend'. Remove all words of length '9' in the given sentence.
Example Output: a boy looks at his birthday cake with his friend

Example Input: Sentence: 'black and white photograph of a park bench in woods'. Remove all words of length '3' in the given sentence.
Example Output: black white photograph of a park bench in woods

Example Input: Sentence: 'a pair of benches by the water are shaded by trees'. Remove all words of length '2' in the given sentence.
Example Output:
a pair benches the water are shaded trees