You are given a code:

def main_solution(x):
    return (func_13('ybgabz', '-') + func_4('qwq'))

Can you predict the output of `main_solution("ekeevztquo")` 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": "ekeevztquo"}, "ref_output": "y-b-g-a-b-zqwq", "ref_code": "def main_solution(x):\n    return (func_13('ybgabz', '-') + func_4('qwq'))", "funcname": "main_solution"}
rule