You are given a code:

def main_solution(x):
    return func_20(func_15(x), func_20('skwoc', x))

Can you predict the output of `main_solution("rirtgtggl")` 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": "rirtgtggl"}, "ref_output": "\u00absrr\u00bbk\u00abiiw\u00bbr\u00abort\u00bbc\u00abgtt\u00bbg\u00abggl\u00bb\u00abt\u00bb\u00abg\u00bb\u00abg\u00bb\u00abl\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_20('skwoc', x))", "funcname": "main_solution"}
rule