You are given a code:

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

Can you predict the output of `main_solution("dxyf")` 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": "dxyf"}, "ref_output": "m\u00abldp\u00bbl\u00abyxm\u00bbl\u00abpyl\u00bby\u00abmfl\u00bbply", "ref_code": "def main_solution(x):\n    return func_20(func_1('mlply', 3), func_15(x))", "funcname": "main_solution"}
rule