You are given a code:

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

Can you predict the output of `main_solution("wukakqu")` 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": "wukakqu"}, "ref_output": "kxyzzn|b|e|k|b|r", "ref_code": "def main_solution(x):\n    return (func_3('xkzyz') + func_13('nbekbr', '|'))", "funcname": "main_solution"}
rule