You are given a code:

def main_solution(x):
    return func_20(('gugeh' + 'aivelm'), func_15('rtpkt'))

Can you predict the output of `main_solution("fupv")` 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": "fupv"}, "ref_output": "g\u00aburg\u00bbe\u00abhta\u00bbi\u00abvpe\u00bbl\u00abmk\u00bb\u00abt\u00bb", "ref_code": "def main_solution(x):\n    return func_20(('gugeh' + 'aivelm'), func_15('rtpkt'))", "funcname": "main_solution"}
rule