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: South Africa president: Mandela is improving Sentence 2: Afghan president delays signing US deal

Ex Output:
0


Ex Input:
Sentence 1: A baby monkey scratches itself. Sentence 2: The monkey scratched his tummy.

Ex Output:
3


Ex Input:
Sentence 1: A rabbit is running from an eagle. Sentence 2: A hare is running from a eagle.

Ex Output:

4