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: 1712 aggiunta 3657 aggiunta 6458 aggiunta 5844 sottrazione 8263 aggiunta 7481
A: 
16889