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: Two people sailing a small white sail boat. Sentence 2: Couple sailing in a small sailboat.

Output: 4


Input: Consider Input: Sentence 1: georgian government websites are under intense cyber attack following russian military strikes against georgia late last week. Sentence 2: the cyber attacks follow russian military strikes launched against georgia late last week.

Output: 5


Input: Consider Input: Sentence 1: Close up of a white sheep with a black head. Sentence 2: A close-up of a sheep with a black head.


Output: 4