You are given a code:

def main_solution(x):
    return func_20(func_15(x), ('tubqx' + 'hndwe'))

Can you predict the output of `main_solution("qdybhoiil")` 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": "qdybhoiil"}, "ref_output": "\u00abtqu\u00bbb\u00abqdx\u00bbh\u00abnyd\u00bbw\u00abeb\u00bb\u00abh\u00bb\u00abo\u00bb\u00abi\u00bb\u00abi\u00bb\u00abl\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), ('tubqx' + 'hndwe'))", "funcname": "main_solution"}
rule