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: 6244 aggiunta 2024 sottrazione 2131
Example Output: 6137

Example Input: 6854 sottrazione 6803 aggiunta 9154 sottrazione 7508 sottrazione 2330
Example Output: -633

Example Input: 6011 aggiunta 6607 aggiunta 9001
Example Output:
21619