You are given a code:

def main_solution(x):
    return func_13(func_20('cfgazm', 'ffhx'), '_')

Can you predict the output of `main_solution("ajsv")` 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": "ajsv"}, "ref_output": "c_f_f_f_g_h_a_x_z_m", "ref_code": "def main_solution(x):\n    return func_13(func_20('cfgazm', 'ffhx'), '_')", "funcname": "main_solution"}
rule