You are given a code:

def main_solution(x):
    return func_20((x + 'xdcwzt'), func_15('cdguo'))

Can you predict the output of `main_solution("fcg")` 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": "fcg"}, "ref_output": "f\u00abccg\u00bbx\u00abddc\u00bbw\u00abzgt\u00bb\u00abu\u00bb\u00abo\u00bb", "ref_code": "def main_solution(x):\n    return func_20((x + 'xdcwzt'), func_15('cdguo'))", "funcname": "main_solution"}
rule