You are given a code:

def main_solution(x):
    return (func_4('xobnwa') + func_4('tiojzq'))

Can you predict the output of `main_solution("uzxnsdg")` 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": "uzxnsdg"}, "ref_output": "xobnwatiojzq", "ref_code": "def main_solution(x):\n    return (func_4('xobnwa') + func_4('tiojzq'))", "funcname": "main_solution"}
rule