instruction:
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.
question:
Sentence: 'a black cat sitting on top of a pot for a plant'. Remove all words of length '7' in the given sentence.
answer:
a black cat on top of a pot for a plant


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


question:
Sentence: 'a very nice looking train in the dark'. Remove all words of length '7' in the given sentence.
answer:

a very nice train in the dark