You are given a code:

def main_solution(x):
    return func_13(('frnlsg' + 'scncu'), '-')

Can you predict the output of `main_solution("evsw")` without writing any code? Please reason and put your final answer in the following json format: {"output": <your output>}, where <your output> should be the final string.
user
{"ref_input": {"x": "evsw"}, "ref_output": "f-r-n-l-s-g-s-c-n-c-u", "ref_code": "def main_solution(x):\n    return func_13(('frnlsg' + 'scncu'), '-')", "funcname": "main_solution"}
rule