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: The broader Standard & Poor's 500 Index .SPX rose 3.47 points, or 0.36 percent, to 977.59. Sentence 2: The tech-laden Nasdaq Composite Index .IXIC shed 8 points, or 0.45 percent, to 1,645.

Ex Output:
1


Ex Input:
Sentence 1: A white dog with red ears is running in the snow. Sentence 2: a wet black dog with a red collar is in the river

Ex Output:
1


Ex Input:
Sentence 1: A cook seasons some dough. Sentence 2: A man is seasoning some dough in a pan.

Ex Output:

4