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: 2431 sottrazione 4910 aggiunta 3990
Example Output: 1511

Example Input: 8933 sottrazione 4420 sottrazione 3836 sottrazione 5126 sottrazione 2669
Example Output: -7118

Example Input: 875 sottrazione 5792 aggiunta 9348
Example Output:
4431