You are given a code:

def main_solution(x):
    return (func_13('slkg', '|') + func_13(x, '_'))

Can you predict the output of `main_solution("kwpumwnjzh")` 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": "kwpumwnjzh"}, "ref_output": "s|l|k|gk_w_p_u_m_w_n_j_z_h", "ref_code": "def main_solution(x):\n    return (func_13('slkg', '|') + func_13(x, '_'))", "funcname": "main_solution"}
rule