You are given a code:

def main_solution(x):
    return func_20(func_19(x, 3), func_15('yznvpt'))

Can you predict the output of `main_solution("ttymgdk")` 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": "ttymgdk"}, "ref_output": "m\u00abgyd\u00bbk\u00abtzt\u00bby\u00abn\u00bb\u00abv\u00bb\u00abp\u00bb\u00abt\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_19(x, 3), func_15('yznvpt'))", "funcname": "main_solution"}
rule