You are given a code:

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

Can you predict the output of `main_solution("ifsx")` 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": "ifsx"}, "ref_output": "\u00abt\u00bb\u00abj\u00bb\u00abu\u00bb\u00bbu\u00ab\u00bbj\u00ab\u00bbt\u00ab", "ref_code": "def main_solution(x):\n    return func_9(func_15('tju'))", "funcname": "main_solution"}
rule