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:
1925 sottrazione 6588 sottrazione 8668

Ex Output:
-13331


Ex Input:
6963 aggiunta 6514 aggiunta 9567

Ex Output:
23044


Ex Input:
7735 aggiunta 6429 sottrazione 6490 sottrazione 8520 sottrazione 1781

Ex Output:

-2627