You are given a code:

def main_solution(x):
    return (func_15('nekstj') + func_5('oekth', 'uzn'))

Can you predict the output of `main_solution("vavtwawrcd")` 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": "vavtwawrcd"}, "ref_output": "\u00abn\u00bb\u00abe\u00bb\u00abk\u00bb\u00abs\u00bb\u00abt\u00bb\u00abj\u00bbuznoekth", "ref_code": "def main_solution(x):\n    return (func_15('nekstj') + func_5('oekth', 'uzn'))", "funcname": "main_solution"}
rule