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.

Ex Input:
Sentence 1: Tokyo to host 2020 Olympic Games Sentence 2: Wrestling to feature in 2020 Tokyo Olympics

Ex Output:
1


Ex Input:
Sentence 1: Cisco executives said they were encouraged by $1.3 billion in cash flow and the increase in net income, but hoped for a rebound. Sentence 2: Cisco executives were encouraged by $1.3 billion in cash flow and the increase in net income, but said they remained ``cautiously optimistic'' about a rebound.

Ex Output:
5


Ex Input:
Sentence 1: 'Grenade attack' kills one and injures at least 11 Sentence 2: Sex attack on woman investigated

Ex Output:

0