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'.

6988 sottrazione 6538 aggiunta 3315 sottrazione 151 sottrazione 4170 aggiunta 3691 aggiunta 7417 aggiunta 2531

13083