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: 7877 sottrazione 88 aggiunta 4049 sottrazione 6074 sottrazione 6953 aggiunta 9435
A: 
8246