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: 8137 sottrazione 1424 sottrazione 8674

Output: -1961


Input: Consider Input: 8092 sottrazione 7612 aggiunta 8051 sottrazione 559

Output: 7972


Input: Consider Input: 6761 aggiunta 9552 aggiunta 7279


Output: 23592