You are given a code:

def main_solution(x):
    return (func_5('qjjez', 'fy') + func_15('xowczd'))

Can you predict the output of `main_solution("xkh")` 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": "xkh"}, "ref_output": "fyqjjez\u00abx\u00bb\u00abo\u00bb\u00abw\u00bb\u00abc\u00bb\u00abz\u00bb\u00abd\u00bb", "ref_code": "def main_solution(x):\n    return (func_5('qjjez', 'fy') + func_15('xowczd'))", "funcname": "main_solution"}
rule