You are given a code:

def main_solution(x):
    return func_5(func_5('thld', 'fi'), 'xgnz')

Can you predict the output of `main_solution("uridxwp")` 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": "uridxwp"}, "ref_output": "xgnzfithld", "ref_code": "def main_solution(x):\n    return func_5(func_5('thld', 'fi'), 'xgnz')", "funcname": "main_solution"}
rule