You are given a code:

def main_solution(x):
    return func_20(func_15('qouq'), (x + 'sli'))

Can you predict the output of `main_solution("zhaoslrekf")` 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": "zhaoslrekf"}, "ref_output": "\u00abzqh\u00bba\u00aboos\u00bbl\u00abrue\u00bbk\u00abfqs\u00bbli", "ref_code": "def main_solution(x):\n    return func_20(func_15('qouq'), (x + 'sli'))", "funcname": "main_solution"}
rule