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: 9894 aggiunta 4212 sottrazione 4225 sottrazione 9920 aggiunta 5027 aggiunta 4973 aggiunta 1526 sottrazione 6198

Solution: 5289