Evaluate the similarity between them and classify them into classes from 0-5 as follows:
0 : The two sentences are completely dissimilar.
1 : The two sentences are not equivalent, but are on the same topic.
2 : The two sentences are not equivalent, but share some details.
3 : The two sentences are roughly equivalent, but some important information differs/missing.
4 : The two sentences are mostly equivalent, but some unimportant details differ.
5 : The two sentences are completely equivalent, as they mean the same thing.

Ex Input:
Sentence 1: china is north korea's closest ally. Sentence 2: north korea is a reclusive state.

Ex Output:
1


Ex Input:
Sentence 1: The woman is walking her dog. Sentence 2: A woman walks her dog down the street.

Ex Output:
4


Ex Input:
Sentence 1: A man is getting inside a car. Sentence 2: An elderly man is getting into a red car.

Ex Output:

4