You are given a code:

def main_solution(x):
    return (func_23('dqq', 3) + func_20(x, 'vfiyly'))

Can you predict the output of `main_solution("dmtvrxz")` 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": "dmtvrxz"}, "ref_output": "dqq1dvmftivyrlxyz", "ref_code": "def main_solution(x):\n    return (func_23('dqq', 3) + func_20(x, 'vfiyly'))", "funcname": "main_solution"}
rule