You are given a code:

def main_solution(x):
    return func_20(func_15('cncez'), func_20(x, 'stftb'))

Can you predict the output of `main_solution("atheaixq")` 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": "atheaixq"}, "ref_output": "\u00abacs\u00bbt\u00abtnh\u00bbf\u00abect\u00bba\u00abbei\u00bbx\u00abqz\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15('cncez'), func_20(x, 'stftb'))", "funcname": "main_solution"}
rule