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: 4910 sottrazione 1532 aggiunta 6160 aggiunta 9314 sottrazione 7394 sottrazione 7970 sottrazione 3159 aggiunta 7143 aggiunta 7979

Solution: 15451