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: 7622 aggiunta 6167 aggiunta 5898 sottrazione 6295 aggiunta 9792 sottrazione 2467
A: 
20717