You are given a code:

def main_solution(x):
    return func_20(func_1(x, 2), func_15('fgcf'))

Can you predict the output of `main_solution("cgbverfd")` 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": "cgbverfd"}, "ref_output": "c\u00abgfb\u00bbv\u00abegr\u00bbf\u00abdcc\u00bbg\u00abbfv\u00bberfd", "ref_code": "def main_solution(x):\n    return func_20(func_1(x, 2), func_15('fgcf'))", "funcname": "main_solution"}
rule