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: 4597 aggiunta 5805 sottrazione 43 aggiunta 8102
Example Output: 18461

Example Input: 9736 sottrazione 1029 sottrazione 2370
Example Output: 6337

Example Input: 1697 sottrazione 8579 sottrazione 5941 sottrazione 4173
Example Output:
-16996