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: 9899 aggiunta 2990 sottrazione 3710 aggiunta 8348 sottrazione 3184 aggiunta 2826 sottrazione 883 aggiunta 346 aggiunta 1803

Solution: 18435