You are given a code:

def main_solution(x):
    return func_20(('zhdc' + 'nlmk'), func_15('xgf'))

Can you predict the output of `main_solution("ivkoqop")` 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": "ivkoqop"}, "ref_output": "z\u00abhxd\u00bbc\u00abngl\u00bbm\u00abkf\u00bb", "ref_code": "def main_solution(x):\n    return func_20(('zhdc' + 'nlmk'), func_15('xgf'))", "funcname": "main_solution"}
rule