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: 1298 aggiunta 9060 sottrazione 9681
Example Output: 677

Example Input: 3256 sottrazione 5464 sottrazione 5786
Example Output: -7994

Example Input: 7807 aggiunta 9979 sottrazione 543
Example Output:
17243