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'.

Example Input: 5690 sottrazione 9656 aggiunta 1232
Example Output: -2734

Example Input: 5376 sottrazione 1516 sottrazione 6409 sottrazione 1769 aggiunta 1832 sottrazione 956
Example Output: -3442

Example Input: 3157 sottrazione 8668 aggiunta 9445
Example Output:
3934