You are given a code:

def main_solution(x):
    return func_20('tuv', 'aldacy')

Can you predict the output of `main_solution("kyfm")` 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": "kyfm"}, "ref_output": "taulvdacy", "ref_code": "def main_solution(x):\n    return func_20('tuv', 'aldacy')", "funcname": "main_solution"}
rule