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: Train in a station. Sentence 2: Trains inside an indoor station.

Ex Output:
4


Ex Input:
Sentence 1: A black and white photo of a woman showing a horse. Sentence 2: a black and white photo of cows in their stalls.

Ex Output:
1


Ex Input:
Sentence 1: The Bishop of Armidale, Peter Brain, was forthright. Sentence 2: He hasn't got much choice, said the Bishop of Armidale, Peter Brain.

Ex Output:

2