You are given a code:

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

Can you predict the output of `main_solution("sthyhwklt")` 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": "sthyhwklt"}, "ref_output": "s|t|h|y|h|w|k|l|t\u00abp\u00bb\u00abi\u00bb\u00aba\u00bb\u00abd\u00bb\u00abn\u00bb", "ref_code": "def main_solution(x):\n    return (func_13(x, '|') + func_15('piadn'))", "funcname": "main_solution"}
rule