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:
1928 sottrazione 1299 sottrazione 8751 aggiunta 2198

Ex Output:
-5924


Ex Input:
2901 sottrazione 1879 sottrazione 5308

Ex Output:
-4286


Ex Input:
8428 aggiunta 5552 sottrazione 9172

Ex Output:

4808