You are given a code:

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

Can you predict the output of `main_solution("qhatbg")` 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": "qhatbg"}, "ref_output": "\u00abnqt\u00bbv\u00abdhp\u00bbn\u00abtav\u00bbd\u00abptn\u00bbt\u00abvbd\u00bbp\u00abg\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_1('ntvdp', 3))", "funcname": "main_solution"}
rule