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'.

Example input: 10 sottrazione 7
Example output: 3
Example explanation: Here, 'sottrazione' represents the subtraction operation. So, the answer is 3 (10-7=3).
Q: 6939 aggiunta 6939 sottrazione 5196 sottrazione 2640 aggiunta 5723 sottrazione 9506 aggiunta 4929 aggiunta 6157 aggiunta 2759
A:
16104