You are given a code:

def main_solution(x):
    return func_13(func_20('ctbhso', x), '_')

Can you predict the output of `main_solution("eojozjtk")` 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": "eojozjtk"}, "ref_output": "c_e_t_o_b_j_h_o_s_z_o_j_t_k", "ref_code": "def main_solution(x):\n    return func_13(func_20('ctbhso', x), '_')", "funcname": "main_solution"}
rule