You are given a code:

def main_solution(x):
    return func_20('yec', 'btnehm')

Can you predict the output of `main_solution("dofalxprnf")` 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": "dofalxprnf"}, "ref_output": "ybetcnehm", "ref_code": "def main_solution(x):\n    return func_20('yec', 'btnehm')", "funcname": "main_solution"}
rule