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 input: 10 sottrazione 7
Example output: 3
Example explanation: Here, 'sottrazione' represents the subtraction operation. So, the answer is 3 (10-7=3).
Q: 2733 aggiunta 2131 aggiunta 6489 sottrazione 2327 aggiunta 9509 aggiunta 1626 aggiunta 8795 aggiunta 3656 sottrazione 7112
A:
25500