You are given a code:

def main_solution(x):
    return (('umvt' + 'yhttf') + func_19('vvcv', 3))

Can you predict the output of `main_solution("gdbwea")` 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": "gdbwea"}, "ref_output": "umvtyhttfvvvc", "ref_code": "def main_solution(x):\n    return (('umvt' + 'yhttf') + func_19('vvcv', 3))", "funcname": "main_solution"}
rule