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: 3956 sottrazione 4291 aggiunta 1217 aggiunta 6236 sottrazione 5681 sottrazione 3910
Example Output: -2473

Example Input: 4043 aggiunta 3937 sottrazione 1208
Example Output: 6772

Example Input: 1946 aggiunta 8156 aggiunta 9461
Example Output:
19563