You are given a code:

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

Can you predict the output of `main_solution("njpugvoo")` 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": "njpugvoo"}, "ref_output": "i|f|o|y|c\u00abk\u00bb\u00abh\u00bb\u00abu\u00bb\u00abv\u00bb\u00abc\u00bb", "ref_code": "def main_solution(x):\n    return (func_13('ifoyc', '|') + func_15('khuvc'))", "funcname": "main_solution"}
rule