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: 5940 sottrazione 4378 aggiunta 680 sottrazione 5351 aggiunta 1968
Example Output: -1141

Example Input: 2305 sottrazione 9099 sottrazione 961 aggiunta 6096
Example Output: -1659

Example Input: 3055 sottrazione 6506 aggiunta 7787
Example Output:
4336