You are given a code:

def main_solution(x):
    return func_20(func_20(x, 'putg'), func_15('vtxlru'))

Can you predict the output of `main_solution("tydvdqcdf")` 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": "tydvdqcdf"}, "ref_output": "t\u00abpvy\u00bbu\u00abdtt\u00bbv\u00abgxd\u00bbq\u00abcld\u00bbf\u00abr\u00bb\u00abu\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_20(x, 'putg'), func_15('vtxlru'))", "funcname": "main_solution"}
rule