You are given a code:

def main_solution(x):
    return func_20(('ghtfkc' + 'mmmbq'), func_15(x))

Can you predict the output of `main_solution("dwfttvyip")` 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": "dwfttvyip"}, "ref_output": "g\u00abhdt\u00bbf\u00abkwc\u00bbm\u00abmfm\u00bbb\u00abqt\u00bb\u00abt\u00bb\u00abv\u00bb\u00aby\u00bb\u00abi\u00bb\u00abp\u00bb", "ref_code": "def main_solution(x):\n    return func_20(('ghtfkc' + 'mmmbq'), func_15(x))", "funcname": "main_solution"}
rule