You are given a code:

def main_solution(x):
    return (func_15('hib') + func_13('uitfrv', '|'))

Can you predict the output of `main_solution("sbpiypakvy")` 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": "sbpiypakvy"}, "ref_output": "\u00abh\u00bb\u00abi\u00bb\u00abb\u00bbu|i|t|f|r|v", "ref_code": "def main_solution(x):\n    return (func_15('hib') + func_13('uitfrv', '|'))", "funcname": "main_solution"}
rule