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 total of 17 cases have been confirmed in the southern city of Basra, the Organization said. Sentence 2: A total of 17 confirmed cases of cholera were reported yesterday by the World Health Organisation in the southern Iraqi city of Basra.

Ex Output:
4


Ex Input:
Sentence 1: Mr Colpin did not specify whether it was this system that was at the centre of the investigation. Sentence 2: Neither OLAF nor the Belgian prosecutors have specified if it was this system that was at the centre of the investigation.

Ex Output:
2


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