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: 4362 aggiunta 4021 sottrazione 6522 aggiunta 6859 sottrazione 464 aggiunta 4641 sottrazione 1900 aggiunta 3254 aggiunta 1575
A:
15826