You are given a code:

def main_solution(x):
    return func_20(func_1(x, 2), func_15('dreefx'))

Can you predict the output of `main_solution("kfmrbobla")` 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": "kfmrbobla"}, "ref_output": "k\u00abfdm\u00bbr\u00abbro\u00bbb\u00ablea\u00bbk\u00abfem\u00bbr\u00abbfo\u00bbb\u00ablxa\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_1(x, 2), func_15('dreefx'))", "funcname": "main_solution"}
rule