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: Shares of SCO closed at $10.93, down 28 cents, in Monday trading on the Nasdaq Stock Market. Sentence 2: IBM shares closed up $1.75, or 2.11 percent, at $84.50 on the New York Stock Exchange.

Ex Output:
1


Ex Input:
Sentence 1: Several cows grazing on the median by the road. Sentence 2: Five cows grazing on a patch of grass between two roadways.

Ex Output:
4


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