You are given a code:

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

Can you predict the output of `main_solution("eohikywm")` 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": "eohikywm"}, "ref_output": "e_o_h_i_k_y_w_m\u00abn\u00bb\u00abe\u00bb\u00abr\u00bb\u00abq\u00bb\u00abn\u00bb", "ref_code": "def main_solution(x):\n    return (func_13(x, '_') + func_15('nerqn'))", "funcname": "main_solution"}
rule