You are given a code:

def main_solution(x):
    return func_20(('tyhv' + 'dbxq'), func_15('jayyr'))

Can you predict the output of `main_solution("ftu")` 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": "ftu"}, "ref_output": "t\u00abyjh\u00bbv\u00abdab\u00bbx\u00abqy\u00bb\u00aby\u00bb\u00abr\u00bb", "ref_code": "def main_solution(x):\n    return func_20(('tyhv' + 'dbxq'), func_15('jayyr'))", "funcname": "main_solution"}
rule