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'.

Input: Consider Input: 8809 sottrazione 8462 sottrazione 6853 sottrazione 2050

Output: -8556


Input: Consider Input: 4597 aggiunta 5805 sottrazione 43 aggiunta 8102

Output: 18461


Input: Consider Input: 5555 sottrazione 2019 sottrazione 4418 aggiunta 4713 aggiunta 8860


Output: 12691