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 toy train is striking a toy car. Sentence 2: A toy train strikes a toy car.

Ex Output:
5


Ex Input:
Sentence 1: A white cat standing on a carpet. Sentence 2: A sheep standing in a forest.

Ex Output:
0


Ex Input:
Sentence 1: Republicans had pledged to complete a Medicare drug package by August, then extended the deadline to Oct. 17, and they are still working on it. Sentence 2: Republicans had pledged to complete a Medicare drug package by August, then extended it to Oct. 17.

Ex Output:

5