Instructions: 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: 2685 aggiunta 8138 aggiunta 4299 sottrazione 2879 sottrazione 2150 sottrazione 3382 sottrazione 4114 aggiunta 1638 sottrazione 3979
Output:
256