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: 10 sottrazione 7
Example solution: 3
Example explanation: Here, 'sottrazione' represents the subtraction operation. So, the answer is 3 (10-7=3).

Problem: 6916 sottrazione 3651 aggiunta 6895 aggiunta 2404 sottrazione 9396 aggiunta 1557 sottrazione 3254 aggiunta 578

Solution: 2049