You are given a code:

def main_solution(x):
    return (func_15(x) + func_20('gdkc', 'xcpelr'))

Can you predict the output of `main_solution("lpcz")` 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": "lpcz"}, "ref_output": "\u00abl\u00bb\u00abp\u00bb\u00abc\u00bb\u00abz\u00bbgxdckpcelr", "ref_code": "def main_solution(x):\n    return (func_15(x) + func_20('gdkc', 'xcpelr'))", "funcname": "main_solution"}
rule