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: elbaradei is the international atomic energy agency chief. Sentence 2: mohammed elbarade is the international atomic energy agency's director general.

Ex Output:
5


Ex Input:
Sentence 1: Someone standing on a snowy mountain, watching a plane. Sentence 2: A man stands on a mountain, watching a plane.

Ex Output:
4


Ex Input:
Sentence 1: A person is doing pencil tricks with his hand. Sentence 2: A person is slicing carrots in half.

Ex Output:

0