You are given a code:

def main_solution(x):
    return func_20(func_23(x, 3), func_15('oueftx'))

Can you predict the output of `main_solution("zpvmjnqd")` 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": "zpvmjnqd"}, "ref_output": "z\u00abpov\u00bbm\u00abjun\u00bbq\u00abde1\u00bb\u00abf\u00bb\u00abt\u00bb\u00abx\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_23(x, 3), func_15('oueftx'))", "funcname": "main_solution"}
rule