You are given a code:

def main_solution(x):
    return func_13(func_20('igox', 'ptehe'), '_')

Can you predict the output of `main_solution("wkkazxd")` 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": "wkkazxd"}, "ref_output": "i_p_g_t_o_e_x_h_e", "ref_code": "def main_solution(x):\n    return func_13(func_20('igox', 'ptehe'), '_')", "funcname": "main_solution"}
rule