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: 3644 aggiunta 1000 sottrazione 8591 sottrazione 6867 aggiunta 6679

Output: -4135


Input: Consider Input: 9424 aggiunta 2739 aggiunta 3840 sottrazione 2150

Output: 13853


Input: Consider Input: 6201 aggiunta 6997 sottrazione 617


Output: 12581