You are given a code:

def main_solution(x):
    return func_20(func_15('aqwer'), func_13('cmgbhi', '_'))

Can you predict the output of `main_solution("nmci")` 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": "nmci"}, "ref_output": "\u00abca_\u00bbm\u00ab_qg\u00bb_\u00abbw_\u00bbh\u00ab_ei\u00bb\u00abr\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15('aqwer'), func_13('cmgbhi', '_'))", "funcname": "main_solution"}
rule