You are given a code:

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

Can you predict the output of `main_solution("iholigjlcl")` 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": "iholigjlcl"}, "ref_output": "i_i_m_h_y_o_l_i_g_j_l_c_l", "ref_code": "def main_solution(x):\n    return func_13(func_20('imy', x), '_')", "funcname": "main_solution"}
rule