You are given a code:

def main_solution(x):
    return func_20(func_15('yray'), (x + 'dwz'))

Can you predict the output of `main_solution("iwzniyhy")` 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": "iwzniyhy"}, "ref_output": "\u00abiyw\u00bbz\u00abnri\u00bby\u00abhay\u00bbd\u00abwyz\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15('yray'), (x + 'dwz'))", "funcname": "main_solution"}
rule