You are given a code:

def main_solution(x):
    return func_20(func_15('altgph'), func_20(x, 'lkmt'))

Can you predict the output of `main_solution("fqksqvbgb")` 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": "fqksqvbgb"}, "ref_output": "\u00abfal\u00bbq\u00abklk\u00bbm\u00abstt\u00bbq\u00abvgb\u00bbg\u00abbp\u00bb\u00abh\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15('altgph'), func_20(x, 'lkmt'))", "funcname": "main_solution"}
rule