You are given a code:

def main_solution(x):
    return (func_15(x) + func_13('rfexgf', '_'))

Can you predict the output of `main_solution("wcsc")` 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": "wcsc"}, "ref_output": "\u00abw\u00bb\u00abc\u00bb\u00abs\u00bb\u00abc\u00bbr_f_e_x_g_f", "ref_code": "def main_solution(x):\n    return (func_15(x) + func_13('rfexgf', '_'))", "funcname": "main_solution"}
rule