You are given a code:

def main_solution(x):
    return func_20(func_15('gbkq'), func_20('qiod', 'bfx'))

Can you predict the output of `main_solution("kkr")` 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": "kkr"}, "ref_output": "\u00abqgb\u00bbi\u00abfbo\u00bbx\u00abdk\u00bb\u00abq\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15('gbkq'), func_20('qiod', 'bfx'))", "funcname": "main_solution"}
rule