You are given a code:

def main_solution(x):
    return func_20(func_19(x, 1), func_15('fcgvy'))

Can you predict the output of `main_solution("objcegdthn")` 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": "objcegdthn"}, "ref_output": "b\u00abjfc\u00bbe\u00abgcd\u00bbt\u00abhgn\u00bbo\u00abv\u00bb\u00aby\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_19(x, 1), func_15('fcgvy'))", "funcname": "main_solution"}
rule