You are given a code:

def main_solution(x):
    return (func_22('gpq') + func_20('jtiqz', 'zvg'))

Can you predict the output of `main_solution("rhzbtumlk")` 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": "rhzbtumlk"}, "ref_output": "gpjztvigqz", "ref_code": "def main_solution(x):\n    return (func_22('gpq') + func_20('jtiqz', 'zvg'))", "funcname": "main_solution"}
rule