You are given a code:

def main_solution(x):
    return func_20(func_11('nfhgru', 3), func_15('iqot'))

Can you predict the output of `main_solution("ppwzi")` 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": "ppwzi"}, "ref_output": "q\u00abiik\u00bbj\u00abuqx\u00bb\u00abo\u00bb\u00abt\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_11('nfhgru', 3), func_15('iqot'))", "funcname": "main_solution"}
rule