You are given a code:

def main_solution(x):
    return (func_13(x, '|') + func_3('cbxczt'))

Can you predict the output of `main_solution("vubgxhefk")` 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": "vubgxhefk"}, "ref_output": "v|u|b|g|x|h|e|f|kbcctxz", "ref_code": "def main_solution(x):\n    return (func_13(x, '|') + func_3('cbxczt'))", "funcname": "main_solution"}
rule