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.

Example Input: Sentence 1: A man in swimming trunks is standing against some rocks. Sentence 2: A man in a gray shirt climbs a large rock wall.
Example Output: 1

Example Input: Sentence 1: A black and white dog looking at the camera. Sentence 2: A small black and white goat in a pen looking up at the camera.
Example Output: 1

Example Input: Sentence 1: the back of a stop sign with many stickers on it. Sentence 2: The back of the stop sign is adorned with stickers.
Example Output:
5