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'.

Input: Consider Input: 1925 sottrazione 6588 sottrazione 8668

Output: -13331


Input: Consider Input: 8472 sottrazione 4543 aggiunta 8615 sottrazione 4352

Output: 8192


Input: Consider Input: 2286 aggiunta 5157 sottrazione 4766 aggiunta 2342


Output: 5019