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: 9761 aggiunta 2874 aggiunta 6067 sottrazione 2839 sottrazione 7278 aggiunta 3730 aggiunta 1311 sottrazione 8985
A:
4641