You are given a code:

def main_solution(x):
    return (('iuroce' + x) + func_15('bisyw'))

Can you predict the output of `main_solution("epnrfzdc")` 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": "epnrfzdc"}, "ref_output": "iuroceepnrfzdc\u00abb\u00bb\u00abi\u00bb\u00abs\u00bb\u00aby\u00bb\u00abw\u00bb", "ref_code": "def main_solution(x):\n    return (('iuroce' + x) + func_15('bisyw'))", "funcname": "main_solution"}
rule