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 bird sits in a tree. Sentence 2: A bird sits in a leafless tree.

Output: 4


Input: Consider Input: Sentence 1: A dog is running on the ground. Sentence 2: A girl is tapping her finger nails.

Output: 0


Input: Consider Input: Sentence 1: China stocks end lower Thursday Sentence 2: China stocks close lower on Thursday


Output: 5