You are given a code:

def main_solution(x):
    return (func_15('afsrx') + func_20('usixd', 'dmrks'))

Can you predict the output of `main_solution("bntmrkxgnw")` 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": "bntmrkxgnw"}, "ref_output": "\u00aba\u00bb\u00abf\u00bb\u00abs\u00bb\u00abr\u00bb\u00abx\u00bbudsmirxkds", "ref_code": "def main_solution(x):\n    return (func_15('afsrx') + func_20('usixd', 'dmrks'))", "funcname": "main_solution"}
rule