You are given a code:

def main_solution(x):
    return func_20(('rqepb' + x), func_15('kyu'))

Can you predict the output of `main_solution("tnfnxrjmq")` 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": "tnfnxrjmq"}, "ref_output": "r\u00abqke\u00bbp\u00abbyt\u00bbn\u00abfun\u00bbxrjmq", "ref_code": "def main_solution(x):\n    return func_20(('rqepb' + x), func_15('kyu'))", "funcname": "main_solution"}
rule