You are given a code:

def main_solution(x):
    return func_20(func_11('lybqa', 5), func_15('zvu'))

Can you predict the output of `main_solution("jmtjrrkiu")` 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": "jmtjrrkiu"}, "ref_output": "q\u00abdzg\u00bbv\u00abfv\u00bb\u00abu\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_11('lybqa', 5), func_15('zvu'))", "funcname": "main_solution"}
rule