Instructions: 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: 4266 aggiunta 908 sottrazione 587 aggiunta 6978 sottrazione 3151 aggiunta 6380 sottrazione 4830 sottrazione 5702 sottrazione 9769
Output:
-5507