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: 6742 sottrazione 6935 aggiunta 3384 sottrazione 9973 aggiunta 1923
Example Output: -4859

Example Input: 1925 sottrazione 6588 sottrazione 8668
Example Output: -13331

Example Input: 9797 aggiunta 5461 aggiunta 1045
Example Output:
16303