You are given a code:

def main_solution(x):
    return func_20(('ofto' + 'bgugt'), func_15('upqlir'))

Can you predict the output of `main_solution("rzqtvi")` 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": "rzqtvi"}, "ref_output": "o\u00abfut\u00bbo\u00abbpg\u00bbu\u00abgqt\u00bb\u00abl\u00bb\u00abi\u00bb\u00abr\u00bb", "ref_code": "def main_solution(x):\n    return func_20(('ofto' + 'bgugt'), func_15('upqlir'))", "funcname": "main_solution"}
rule