You are given a code:

def main_solution(x):
    return func_17('dpzfx')

Can you predict the output of `main_solution("dupgmub")` 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": "dupgmub"}, "ref_output": "xfzpd", "ref_code": "def main_solution(x):\n    return func_17('dpzfx')", "funcname": "main_solution"}
rule