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: 6627 sottrazione 2115 aggiunta 656 sottrazione 3935 aggiunta 6095 aggiunta 1040 sottrazione 6461 aggiunta 3751 sottrazione 4822
A:
836