You are given a code:

def main_solution(x):
    return func_20(func_15('syds'), func_5('xqfm', 'rio'))

Can you predict the output of `main_solution("eky")` 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": "eky"}, "ref_output": "\u00abrsi\u00bbo\u00abxyq\u00bbf\u00abmd\u00bb\u00abs\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15('syds'), func_5('xqfm', 'rio'))", "funcname": "main_solution"}
rule