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: But the FBI never kept tabs on al-Bayoumi - even though it had received information that he was a Saudi agent, the document says. Sentence 2: But the bureau never kept tabs on al-Bayoumi—despite receiving prior information he was a secret Saudi agent, the report says.

Output: 5


Input: Consider Input: Sentence 1: amnesty international is a rights group based in london. Sentence 2: the international institute for strategic studies is located in london.

Output: 1


Input: Consider Input: Sentence 1: A man stands in front of a train. Sentence 2: A man is standing in front of a raised statue,.


Output: 2