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: A girl riding on a brown and white horse. Sentence 2: A girl riding a brown horse.

Ex Output:
4


Ex Input:
Sentence 1: That exploit works on unpatched Windows 2000 machines with Service Pack 3 and 4. Sentence 2: Both Counterpane and iDefense contend that the exploit works effectively against Windows 2000 systems running Service Pack 3 and 4.

Ex Output:
3


Ex Input:
Sentence 1: Greek far-right leader imprisoned pending trial Sentence 2: Greek Far-Right Leader Imprisoned Pending Trial

Ex Output:

5