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: 1570 sottrazione 782 sottrazione 414 aggiunta 2757 aggiunta 9852 aggiunta 8437 sottrazione 9660 sottrazione 2776 aggiunta 9337

Solution: 18321