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: 547 sottrazione 5804 aggiunta 6717 aggiunta 8431 sottrazione 9106 aggiunta 2196 aggiunta 8116 sottrazione 20 aggiunta 9389
A:
20466