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: 8642 aggiunta 7150 aggiunta 8442 aggiunta 4152 aggiunta 6701 sottrazione 239 sottrazione 8613 sottrazione 6008
A: 
20227