You are given a code:

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

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