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: Yahoo agrees to buy Tumblr for $1.1 billion cash Sentence 2: Yahoo to Buy Tumblr for $1.1 Billion

Ex Output:
5


Ex Input:
Sentence 1: Two girls are sitting in front of a statue. Sentence 2: Two blonde girls are sitting next to a statue

Ex Output:
4


Ex Input:
Sentence 1: Two dogs in a yard. Sentence 2: Two dogs in a stream.

Ex Output:

2