You are given a code:

def main_solution(x):
    return func_20(func_15(x), func_20('tutfm', x))

Can you predict the output of `main_solution("qpljthxat")` 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": "qpljthxat"}, "ref_output": "\u00abtqq\u00bbu\u00abppt\u00bbl\u00abflj\u00bbm\u00abtjh\u00bbx\u00abatt\u00bb\u00abh\u00bb\u00abx\u00bb\u00aba\u00bb\u00abt\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_20('tutfm', x))", "funcname": "main_solution"}
rule