You are given a code:

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

Can you predict the output of `main_solution("eavqb")` 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": "eavqb"}, "ref_output": "k-j-h-h-d-p-g-g", "ref_code": "def main_solution(x):\n    return func_13(('kjhhd' + 'pgg'), '-')", "funcname": "main_solution"}
rule