CommonList output이 안되는데 무엇이 문제일까요 ?

from langchain.output_parsers import CommaSeparatedListOutputParserfrom langchain.prompts import PromptTemplate
output_parser = CommaSeparatedListOutputParser()
format_instructions = output_parser.get_format_instructions()print(f"instruction : {format_instructions}")# instruction : Your response should be a list of comma separated values, eg: `foo, bar, baz`
prompt = PromptTemplate(    template="List five {subject}.\n{format_instructions}",    input_variables=["subject"],    partial_variables={"format_instructions": format_instructions},)
from langchain_openai import OpenAI
llm = OpenAI(temperature=0)
_input = prompt.format(subject="ice create flavors")output = llm.invoke(_input)
print(output_parser.parse(output))

# ['1. Vanilla\n2. Chocolate\n3. Strawberry\n4. Mint\n5. Coffee']

이렇게 작성했는데, Output이 ['1. Vanilla\n2. Chocolate\n3. Strawberry\n4. Mint\n5. Coffee'] 이렇게 나옵니다.. parser의 문제일까요 모델의 문제일까요 ?