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: 5928 aggiunta 6247 aggiunta 9885 aggiunta 1739 sottrazione 6688 aggiunta 5777 aggiunta 8513 aggiunta 8641

Solution: 40042