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: 7244 sottrazione 8940 sottrazione 934

Output: -2630


Input: Consider Input: 9640 aggiunta 9387 aggiunta 5711 aggiunta 1532 sottrazione 1216 sottrazione 1344 sottrazione 4197


Output: 19513