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: 4986 aggiunta 8653 sottrazione 9809

Output: 3830


Input: Consider Input: 8257 aggiunta 5338 sottrazione 5680 sottrazione 1115 sottrazione 6915

Output: -115


Input: Consider Input: 5772 sottrazione 9870 aggiunta 9628


Output: 5530