You are given a code:

def main_solution(x):
    return func_20('jkxvee', 'fhdy')

Can you predict the output of `main_solution("pyzck")` 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": "pyzck"}, "ref_output": "jfkhxdvyee", "ref_code": "def main_solution(x):\n    return func_20('jkxvee', 'fhdy')", "funcname": "main_solution"}
rule