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: An airplane is flying in the air. Sentence 2: A South African Airways plane is flying in a blue sky.

Ex Output:
3


Ex Input:
Sentence 1: A animal is eating. Sentence 2: The animal is hopping.

Ex Output:
0


Ex Input:
Sentence 1: A woman cuts up a vegetable. Sentence 2: A woman is slicing egg plant.

Ex Output:

2