You are given a code:

def main_solution(x):
    return func_20(func_20('dgu', 'lzvv'), func_15('xsvpr'))

Can you predict the output of `main_solution("yvglih")` 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": "yvglih"}, "ref_output": "d\u00ablxg\u00bbz\u00abusv\u00bbv\u00abv\u00bb\u00abp\u00bb\u00abr\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_20('dgu', 'lzvv'), func_15('xsvpr'))", "funcname": "main_solution"}
rule