You are given a code:

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

Can you predict the output of `main_solution("yrpcmbn")` 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": "yrpcmbn"}, "ref_output": "\u00abu\u00bb\u00abd\u00bb\u00abw\u00bb\u00abv\u00bb\u00aby\u00bby|r|p|c|m|b|n", "ref_code": "def main_solution(x):\n    return (func_15('udwvy') + func_13(x, '|'))", "funcname": "main_solution"}
rule