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: 6490 aggiunta 9306 aggiunta 3296 sottrazione 5730 aggiunta 2172 sottrazione 6464 aggiunta 6592 aggiunta 6916 sottrazione 1898

Solution: 20680