You are given a code:

def main_solution(x):
    return (func_19('uedr', 3) + func_20('aevtx', 'eqrvdg'))

Can you predict the output of `main_solution("ldtfhhzgg")` 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": "ldtfhhzgg"}, "ref_output": "ruedaeeqvrtvxdg", "ref_code": "def main_solution(x):\n    return (func_19('uedr', 3) + func_20('aevtx', 'eqrvdg'))", "funcname": "main_solution"}
rule