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: 9858 aggiunta 4630 aggiunta 208 aggiunta 9802 sottrazione 3989
A: 
20509