You are given a code:

def main_solution(x):
    return func_9(func_15('nfgbmy'))

Can you predict the output of `main_solution("con")` 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": "con"}, "ref_output": "\u00abn\u00bb\u00abf\u00bb\u00abg\u00bb\u00abb\u00bb\u00abm\u00bb\u00aby\u00bb\u00bby\u00ab\u00bbm\u00ab\u00bbb\u00ab\u00bbg\u00ab\u00bbf\u00ab\u00bbn\u00ab", "ref_code": "def main_solution(x):\n    return func_9(func_15('nfgbmy'))", "funcname": "main_solution"}
rule