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: Slutstamp! A dear friend from Ohio sent me this. Sentence 2: A dear friend from Ohio sent me this.

Output: 4


Input: Consider Input: Sentence 1: US Cannot 'Conclusively Determine' Chemical Weapons Use in Syria Sentence 2: U.S. Sees No Conclusive Evidence of Chemical Arms Use by Syria

Output: 5


Input: Consider Input: Sentence 1: Nixon, Ford and Carter shut down the oilfields? Sentence 2: No has has shut down the oil fields.


Output: 2