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: 8257 aggiunta 5338 sottrazione 5680 sottrazione 1115 sottrazione 6915

Output: -115


Input: Consider Input: 672 sottrazione 4404 aggiunta 5593 aggiunta 7193 aggiunta 7968

Output: 17022


Input: Consider Input: 5299 aggiunta 4046 sottrazione 6302


Output: 3043