You are given a code:

def main_solution(x):
    return func_13(func_5('izdc', 'zh'), '_')

Can you predict the output of `main_solution("ntpdcrxll")` 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": "ntpdcrxll"}, "ref_output": "z_h_i_z_d_c", "ref_code": "def main_solution(x):\n    return func_13(func_5('izdc', 'zh'), '_')", "funcname": "main_solution"}
rule