You are given a code:

def main_solution(x):
    return func_13((x + 'baw'), '-')

Can you predict the output of `main_solution("tvfjqtvf")` 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": "tvfjqtvf"}, "ref_output": "t-v-f-j-q-t-v-f-b-a-w", "ref_code": "def main_solution(x):\n    return func_13((x + 'baw'), '-')", "funcname": "main_solution"}
rule