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: Two green and white trains sitting on the tracks. Sentence 2: Two green and white trains on tracks.

Ex Output:
4


Ex Input:
Sentence 1: A blue bird perches on the gloved hand of a person. Sentence 2: A bird is perched on a person's gloved hand.

Ex Output:
4


Ex Input:
Sentence 1: police stated tsai wen-huang would be extradited to taiwan. Sentence 2: police stated that-- chung has been on the run.

Ex Output:

2