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: 9769 sottrazione 4257 sottrazione 8674 aggiunta 4572 sottrazione 9138 aggiunta 8467 aggiunta 643 aggiunta 4501 sottrazione 3893
A:
1990