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: A man walking down the stairs. Sentence 2: A man walks down a staircase.

Ex Output:
5


Ex Input:
Sentence 1: The two dogs were in the pen. Sentence 2: The cowboy rode his horse in the desert.

Ex Output:
0


Ex Input:
Sentence 1: Palestinian diplomat dies in Prague blast Sentence 2: Palestinian diplomat killed in explosion in Prague

Ex Output:

5