You are given a code:

def main_solution(x):
    return func_17(func_15('ykkwzd'))

Can you predict the output of `main_solution("lzetdx")` 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": "lzetdx"}, "ref_output": "\u00bbd\u00ab\u00bbz\u00ab\u00bbw\u00ab\u00bbk\u00ab\u00bbk\u00ab\u00bby\u00ab", "ref_code": "def main_solution(x):\n    return func_17(func_15('ykkwzd'))", "funcname": "main_solution"}
rule