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: 1298 aggiunta 9060 sottrazione 9681

Output: 677


Input: Consider Input: 4807 aggiunta 2373 sottrazione 1978 aggiunta 2045 sottrazione 9395

Output: -2148


Input: Consider Input: 2336 sottrazione 6818 sottrazione 3283 sottrazione 573 aggiunta 4183


Output: -4155