You are given a code:

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

Can you predict the output of `main_solution("kvkfg")` 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": "kvkfg"}, "ref_output": "n|a|v|e|r|y\u00aba\u00bb\u00abb\u00bb\u00abz\u00bb\u00abh\u00bb\u00abd\u00bb", "ref_code": "def main_solution(x):\n    return (func_13('navery', '|') + func_15('abzhd'))", "funcname": "main_solution"}
rule