Definition: 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'.
Input: 6662 sottrazione 5253 aggiunta 9834 sottrazione 7539 sottrazione 1196 sottrazione 2855 sottrazione 28 aggiunta 5257
Output:
4882