You are given a code:

def main_solution(x):
    return (func_5('vcoeq', 'pkby') + func_15('yinxd'))

Can you predict the output of `main_solution("rujwpvi")` 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": "rujwpvi"}, "ref_output": "pkbyvcoeq\u00aby\u00bb\u00abi\u00bb\u00abn\u00bb\u00abx\u00bb\u00abd\u00bb", "ref_code": "def main_solution(x):\n    return (func_5('vcoeq', 'pkby') + func_15('yinxd'))", "funcname": "main_solution"}
rule