You are given a code:

def main_solution(x):
    return func_20(func_1('oigu', 4), func_15('vtzi'))

Can you predict the output of `main_solution("ldqbo")` 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": "ldqbo"}, "ref_output": "o\u00abivg\u00bbu\u00aboti\u00bbg\u00abuzo\u00bbi\u00abgiu\u00bboigu", "ref_code": "def main_solution(x):\n    return func_20(func_1('oigu', 4), func_15('vtzi'))", "funcname": "main_solution"}
rule