You are given a code:

def main_solution(x):
    return func_20(func_13('mdszo', '_'), func_15('ubwo'))

Can you predict the output of `main_solution("kjmvpgildb")` 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": "kjmvpgildb"}, "ref_output": "m\u00ab_ud\u00bb_\u00absb_\u00bbz\u00ab_wo\u00bb\u00abo\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_13('mdszo', '_'), func_15('ubwo'))", "funcname": "main_solution"}
rule