You are given a code:

def main_solution(x):
    return func_20(('ftid' + 'kgrxbd'), func_15('xyrt'))

Can you predict the output of `main_solution("irnwvhyxuh")` 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": "irnwvhyxuh"}, "ref_output": "f\u00abtxi\u00bbd\u00abkyg\u00bbr\u00abxrb\u00bbd\u00abt\u00bb", "ref_code": "def main_solution(x):\n    return func_20(('ftid' + 'kgrxbd'), func_15('xyrt'))", "funcname": "main_solution"}
rule