You are given a code:

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

Can you predict the output of `main_solution("uscybjov")` 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": "uscybjov"}, "ref_output": "\u00abu\u00bb\u00abz\u00bb\u00abe\u00bb\u00abc\u00bb\u00aba\u00bb\u00abe\u00bbu_s_c_y_b_j_o_v", "ref_code": "def main_solution(x):\n    return (func_15('uzecae') + func_13(x, '_'))", "funcname": "main_solution"}
rule