You are given a code:

def main_solution(x):
    return func_13(func_5('qhs', 'av'), '_')

Can you predict the output of `main_solution("mxaeqi")` 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": "mxaeqi"}, "ref_output": "a_v_q_h_s", "ref_code": "def main_solution(x):\n    return func_13(func_5('qhs', 'av'), '_')", "funcname": "main_solution"}
rule