You are given a code:

def main_solution(x):
    return func_20(func_5(x, 'mtt'), func_15(x))

Can you predict the output of `main_solution("skwyefwyj")` 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": "skwyefwyj"}, "ref_output": "m\u00abtst\u00bbs\u00abkkw\u00bby\u00abewf\u00bbw\u00abyyj\u00bb\u00abe\u00bb\u00abf\u00bb\u00abw\u00bb\u00aby\u00bb\u00abj\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_5(x, 'mtt'), func_15(x))", "funcname": "main_solution"}
rule