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'.

Ex Input:
2431 sottrazione 4910 aggiunta 3990

Ex Output:
1511


Ex Input:
769 aggiunta 7758 aggiunta 7584

Ex Output:
16111


Ex Input:
2210 aggiunta 5707 sottrazione 8891

Ex Output:

-974


