You are given a code:

def main_solution(x):
    return func_20(func_15('gsqja'), func_5('kvxbgx', 'axd'))

Can you predict the output of `main_solution("zzlstj")` 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": "zzlstj"}, "ref_output": "\u00abagx\u00bbd\u00abksv\u00bbx\u00abbqg\u00bbx\u00abj\u00bb\u00aba\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15('gsqja'), func_5('kvxbgx', 'axd'))", "funcname": "main_solution"}
rule