You are given a code:

def main_solution(x):
    return func_20(func_17(x), func_15('ekzki'))

Can you predict the output of `main_solution("tfmqxbjmm")` 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": "tfmqxbjmm"}, "ref_output": "m\u00abmej\u00bbb\u00abxkq\u00bbm\u00abfzt\u00bb\u00abk\u00bb\u00abi\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_17(x), func_15('ekzki'))", "funcname": "main_solution"}
rule