You are given a code:

def main_solution(x):
    return func_17(func_9('xvr'))

Can you predict the output of `main_solution("mnw")` 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": "mnw"}, "ref_output": "xvrrvx", "ref_code": "def main_solution(x):\n    return func_17(func_9('xvr'))", "funcname": "main_solution"}
rule