You are given a code:

def main_solution(x):
    return func_20(func_15(x), func_20('zvwcg', x))

Can you predict the output of `main_solution("ljmvxu")` 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": "ljmvxu"}, "ref_output": "\u00abzll\u00bbv\u00abjjw\u00bbm\u00abcmv\u00bbg\u00abxvu\u00bb\u00abx\u00bb\u00abu\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_20('zvwcg', x))", "funcname": "main_solution"}
rule