You are given a code:

def main_solution(x):
    return func_20(func_4(x), func_15('ozqu'))

Can you predict the output of `main_solution("ancpjhxuyx")` 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": "ancpjhxuyx"}, "ref_output": "a\u00abnoc\u00bbp\u00abjzh\u00bbx\u00abuqy\u00bbx\u00abu\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_4(x), func_15('ozqu'))", "funcname": "main_solution"}
rule