You are given a code:

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

Can you predict the output of `main_solution("uesubgyoo")` 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": "uesubgyoo"}, "ref_output": "\u00abl\u00bb\u00abw\u00bb\u00aby\u00bbp_v_y_k_t_l", "ref_code": "def main_solution(x):\n    return (func_15('lwy') + func_13('pvyktl', '_'))", "funcname": "main_solution"}
rule