You will be given a sentence. Check whether the sentence is grammatically correct and is meaningful. If the sentence is grammatically correct, then answer with '1', otherwise answer with '0'.

Example Input: Sandy taught the children the alphabet, but only got as far as the letter `` r ''.
Example Output: 1

Example Input: He can't pay taxes, can he?
Example Output: 1

Example Input: A bear occupies the cave.
Example Output:
1