You are given a code:

def main_solution(x):
    return func_20(func_15('nak'), func_17(x))

Can you predict the output of `main_solution("uiojgwl")` 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": "uiojgwl"}, "ref_output": "\u00ablnw\u00bbg\u00abjao\u00bbi\u00abuk\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15('nak'), func_17(x))", "funcname": "main_solution"}
rule