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'.
Q: 8637 aggiunta 9679 aggiunta 7532 sottrazione 2290 aggiunta 1501 aggiunta 8391 aggiunta 8964 aggiunta 3570
A: 
45984