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: 7996 sottrazione 8277 aggiunta 9684 sottrazione 1688 aggiunta 1940 aggiunta 2097 aggiunta 3887

Output: 15639


Input: Consider Input: 2500 sottrazione 4412 aggiunta 1218

Output: -694


Input: Consider Input: 7255 sottrazione 6491 sottrazione 9097


Output: -8333