You are given a code:

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

Can you predict the output of `main_solution("tjzjtbutz")` 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": "tjzjtbutz"}, "ref_output": "\u00abntb\u00bbe\u00abnjb\u00bbe\u00abnzb\u00bbe\u00abj\u00bb\u00abt\u00bb\u00abb\u00bb\u00abu\u00bb\u00abt\u00bb\u00abz\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_1('nbe', 3))", "funcname": "main_solution"}
rule