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: 2505 sottrazione 6692 sottrazione 4578 aggiunta 5271 aggiunta 6960 sottrazione 8331 sottrazione 595 aggiunta 4318
A:
-1142