You are given a code:

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

Can you predict the output of `main_solution("ernjcytuf")` 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": "ernjcytuf"}, "ref_output": "\u00abteb\u00bbp\u00abjrz\u00bbt\u00abbnp\u00bbj\u00abzjt\u00bbb\u00abpcj\u00bbz\u00aby\u00bb\u00abt\u00bb\u00abu\u00bb\u00abf\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_1('tbpjz', 3))", "funcname": "main_solution"}
rule