You are given a code:

def main_solution(x):
    return func_20(func_15(x), func_20('wdwh', 'rchtnk'))

Can you predict the output of `main_solution("gyrwk")` 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": "gyrwk"}, "ref_output": "\u00abwgr\u00bbd\u00abcyw\u00bbh\u00abhrt\u00bbn\u00abkw\u00bb\u00abk\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_20('wdwh', 'rchtnk'))", "funcname": "main_solution"}
rule