You are given a code:

def main_solution(x):
    return func_20('mzdg', 'xvx')

Can you predict the output of `main_solution("lancfxn")` 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": "lancfxn"}, "ref_output": "mxzvdxg", "ref_code": "def main_solution(x):\n    return func_20('mzdg', 'xvx')", "funcname": "main_solution"}
rule