You are given a code:

def main_solution(x):
    return func_20(func_1('dnmv', 3), func_15(x))

Can you predict the output of `main_solution("kmlby")` 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": "kmlby"}, "ref_output": "d\u00abnkm\u00bbv\u00abdmn\u00bbm\u00abvld\u00bbn\u00abmbv\u00bb\u00aby\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_1('dnmv', 3), func_15(x))", "funcname": "main_solution"}
rule