You are given a code:

def main_solution(x):
    return func_20(func_5(x, 'mgku'), func_15('bkys'))

Can you predict the output of `main_solution("qbghtdnomd")` 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": "qbghtdnomd"}, "ref_output": "m\u00abgbk\u00bbu\u00abqkb\u00bbg\u00abhyt\u00bbd\u00abnso\u00bbmd", "ref_code": "def main_solution(x):\n    return func_20(func_5(x, 'mgku'), func_15('bkys'))", "funcname": "main_solution"}
rule