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: 507 sottrazione 2319 sottrazione 5828 sottrazione 8784
Example Output: -16424

Example Input: 2431 sottrazione 4910 aggiunta 3990
Example Output: 1511

Example Input: 4969 aggiunta 1547 sottrazione 9829
Example Output:
-3313