In this task you will be given an arithmetic operation and you have to find its answer. The operators '+' and '-' have been replaced with new symbols. Specifically, '+' has been replaced with the symbol '@' and '-' with the symbol '#'. You need to perform the operations in the given equation return the answer
Example: 6 @ 17
Example solution: 23
Example explanation: Here, '@' represents the addition operation. So, the answer is 23 (6+17=23).

Problem: 6639 # 5724 # 3521 # 6709 # 6185 @ 6067 @ 9560 # 9829 @ 8371

Solution: -1331