You are given a code:

def main_solution(x):
    return (func_23('otk', 2) + func_13('hwykc', '_'))

Can you predict the output of `main_solution("pizwvzzn")` 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": "pizwvzzn"}, "ref_output": "otk1h_w_y_k_c", "ref_code": "def main_solution(x):\n    return (func_23('otk', 2) + func_13('hwykc', '_'))", "funcname": "main_solution"}
rule