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: 8906 aggiunta 7786 aggiunta 8525 sottrazione 1998 aggiunta 6368 aggiunta 8929 aggiunta 7083 aggiunta 7391

Solution: 52990