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: 7098 sottrazione 1434 aggiunta 4555 aggiunta 9937 aggiunta 2250 aggiunta 8049 aggiunta 5675 sottrazione 8171
A:
27959