You are given a code:

def main_solution(x):
    return func_20(func_11('xqe', 5), func_15('fjhvug'))

Can you predict the output of `main_solution("vhkt")` 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": "vhkt"}, "ref_output": "c\u00abvfj\u00bb\u00abj\u00bb\u00abh\u00bb\u00abv\u00bb\u00abu\u00bb\u00abg\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_11('xqe', 5), func_15('fjhvug'))", "funcname": "main_solution"}
rule