You are given a code:

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

Can you predict the output of `main_solution("rltssay")` 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": "rltssay"}, "ref_output": "\u00aburr\u00bbw\u00abllw\u00bbt\u00abmts\u00bbs\u00abasy\u00bb\u00abs\u00bb\u00aba\u00bb\u00aby\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_20('uwwm', x))", "funcname": "main_solution"}
rule