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: 1370 sottrazione 7268 sottrazione 7735

Output: -13633


Input: Consider Input: 968 aggiunta 5257 aggiunta 7238

Output: 13463


Input: Consider Input: 969 aggiunta 504 sottrazione 4845 sottrazione 6330


Output: -9702