You are given a code:

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

Can you predict the output of `main_solution("wzztfmk")` 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": "wzztfmk"}, "ref_output": "\u00abwwz\u00bbz\u00abtzf\u00bbm\u00abkzo\u00bbg\u00abntl\u00bbz\u00abif\u00bb\u00abm\u00bb\u00abk\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), (x + 'ognlzi'))", "funcname": "main_solution"}
rule