You are given a code:

def main_solution(x):
    return func_9(func_13('dbzq', '_'))

Can you predict the output of `main_solution("qnflnctgpk")` 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": "qnflnctgpk"}, "ref_output": "d_b_z_qq_z_b_d", "ref_code": "def main_solution(x):\n    return func_9(func_13('dbzq', '_'))", "funcname": "main_solution"}
rule