You are given a code:

def main_solution(x):
    return (func_13('ouv', '-') + func_13('cosyfl', '_'))

Can you predict the output of `main_solution("ggxiv")` 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": "ggxiv"}, "ref_output": "o-u-vc_o_s_y_f_l", "ref_code": "def main_solution(x):\n    return (func_13('ouv', '-') + func_13('cosyfl', '_'))", "funcname": "main_solution"}
rule