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: 7923 aggiunta 1068 aggiunta 3353 aggiunta 4881 sottrazione 162 sottrazione 1640 aggiunta 5022 sottrazione 2281
A: 
18164