You are given a code:

def main_solution(x):
    return (func_15('zyckpw') + func_13(x, '_'))

Can you predict the output of `main_solution("pxmwgxdv")` 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": "pxmwgxdv"}, "ref_output": "\u00abz\u00bb\u00aby\u00bb\u00abc\u00bb\u00abk\u00bb\u00abp\u00bb\u00abw\u00bbp_x_m_w_g_x_d_v", "ref_code": "def main_solution(x):\n    return (func_15('zyckpw') + func_13(x, '_'))", "funcname": "main_solution"}
rule