You are given a code:

def main_solution(x):
    return (func_13('wvfrn', '|') + func_13('hiya', '-'))

Can you predict the output of `main_solution("yhf")` 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": "yhf"}, "ref_output": "w|v|f|r|nh-i-y-a", "ref_code": "def main_solution(x):\n    return (func_13('wvfrn', '|') + func_13('hiya', '-'))", "funcname": "main_solution"}
rule