You are given a code:

def main_solution(x):
    return func_5(func_13('akbbx', '_'), 'yskf')

Can you predict the output of `main_solution("ocuysuge")` 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": "ocuysuge"}, "ref_output": "yskfa_k_b_b_x", "ref_code": "def main_solution(x):\n    return func_5(func_13('akbbx', '_'), 'yskf')", "funcname": "main_solution"}
rule