You are given a code:

def main_solution(x):
    return func_20(func_15(x), func_1('otpec', 4))

Can you predict the output of `main_solution("ehxenwz")` 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": "ehxenwz"}, "ref_output": "\u00aboet\u00bbp\u00abehc\u00bbo\u00abtxp\u00bbe\u00abceo\u00bbt\u00abpne\u00bbc\u00abowt\u00bbp\u00abezc\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_1('otpec', 4))", "funcname": "main_solution"}
rule