You are given a code:

def main_solution(x):
    return func_20(func_15('uvbn'), func_1('rckt', 3))

Can you predict the output of `main_solution("cem")` 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": "cem"}, "ref_output": "\u00abruc\u00bbk\u00abtvr\u00bbc\u00abkbt\u00bbr\u00abcnk\u00bbt", "ref_code": "def main_solution(x):\n    return func_20(func_15('uvbn'), func_1('rckt', 3))", "funcname": "main_solution"}
rule