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: 8903 sottrazione 5801 sottrazione 3809 aggiunta 5180 aggiunta 7237 aggiunta 6957
A: 
18667