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: 3256 sottrazione 5464 sottrazione 5786
Example Output: -7994

Example Input: 6742 sottrazione 6935 aggiunta 3384 sottrazione 9973 aggiunta 1923
Example Output: -4859

Example Input: 6993 aggiunta 2425 sottrazione 9817
Example Output:
-399