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: 6956 sottrazione 802 aggiunta 8573 aggiunta 4801

Output: 19528


Input: Consider Input: 5912 aggiunta 8754 aggiunta 4209

Output: 18875


Input: Consider Input: 4141 aggiunta 1525 aggiunta 9837 sottrazione 9821


Output: 5682