You are given a code:

def main_solution(x):
    return func_20(func_13('ujsb', '_'), func_15('sdwli'))

Can you predict the output of `main_solution("tdvaandhz")` 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": "tdvaandhz"}, "ref_output": "u\u00ab_sj\u00bb_\u00absd_\u00bbb\u00abw\u00bb\u00abl\u00bb\u00abi\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_13('ujsb', '_'), func_15('sdwli'))", "funcname": "main_solution"}
rule