In this task you will be given an arithmetic operation in Italian and you have to find its answer. The operations 'addition' and 'subtraction' have been replaced with their italian translations i.e you need to perform addition when you see 'aggiunta' and subtraction in case of 'sottrazione'.

Example input: 10 sottrazione 7
Example output: 3
Example explanation: Here, 'sottrazione' represents the subtraction operation. So, the answer is 3 (10-7=3).
Q: 7793 aggiunta 6218 sottrazione 5614 sottrazione 9993 sottrazione 9751 aggiunta 4951 sottrazione 6208 sottrazione 379 sottrazione 6981
A:
-19964