You are given a code:

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

Can you predict the output of `main_solution("jgtwvtuf")` 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": "jgtwvtuf"}, "ref_output": "j-g-t-w-v-t-u-f-l-u-b-q-z-i", "ref_code": "def main_solution(x):\n    return func_13((x + 'lubqzi'), '-')", "funcname": "main_solution"}
rule