You are given a code:

def main_solution(x):
    return func_20(func_20('vrm', 'kvt'), func_15('crez'))

Can you predict the output of `main_solution("cyqxb")` 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": "cyqxb"}, "ref_output": "v\u00abkcr\u00bbv\u00abmrt\u00bb\u00abe\u00bb\u00abz\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_20('vrm', 'kvt'), func_15('crez'))", "funcname": "main_solution"}
rule