Given the task definition and input, reply with output. 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'.

6882 sottrazione 1920 aggiunta 4435 aggiunta 5134 sottrazione 9778 sottrazione 8719

-3966