You are given a code:

def main_solution(x):
    return func_13(func_20('plxx', 'hhssgk'), '|')

Can you predict the output of `main_solution("epjfv")` 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": "epjfv"}, "ref_output": "p|h|l|h|x|s|x|s|g|k", "ref_code": "def main_solution(x):\n    return func_13(func_20('plxx', 'hhssgk'), '|')", "funcname": "main_solution"}
rule