You are given a code:

def main_solution(x):
    return func_20(func_1(x, 3), func_15('zxurh'))

Can you predict the output of `main_solution("tfdvlvdmnc")` 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": "tfdvlvdmnc"}, "ref_output": "t\u00abfzd\u00bbv\u00ablxv\u00bbd\u00abmun\u00bbc\u00abtrf\u00bbd\u00abvhl\u00bbvdmnctfdvlvdmnc", "ref_code": "def main_solution(x):\n    return func_20(func_1(x, 3), func_15('zxurh'))", "funcname": "main_solution"}
rule