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.

Input: Consider Input: Sentence 1: A black and brown dog walks through the snow near a building. Sentence 2: An older man stands outside a old boarded up building.

Output: 1


Input: Consider Input: Sentence 1: X'mas cruise passengers hit by Norovirus Sentence 2: Missing cruise passenger is a NSW ambo

Output: 0


Input: Consider Input: Sentence 1: no other drug has become as integral in decades. Sentence 2: the drug has been around in other forms for years.


Output: 2