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: 8174 aggiunta 5249 sottrazione 2261 aggiunta 6911 aggiunta 1139 sottrazione 6841 sottrazione 440 aggiunta 8325

Solution: 20256