Definition: Compose a new way to ask the same question. The new question must be asking the exact same thing as the original question does. Without any other information, you should be able to tell that the original question and the new question are the same. Preserve bracketed phrases in your new question. You can change the rest of the question provided the above requirements are satisfied. The new question must have a natural, fluent formulation, as if it were composed by a native English speaker. You will be given three pieces of information to help you create better questions. Those are: "Answer": the answer to the question, e.g., "Honolulu". "Answer Type": the type of the answer, e.g., "Location". "Auxiliary Information" is a detailed description of some concepts mentioned in the question, if any.
Input: original question: Which calendar system contains [Sunday]?
answer: islamic calendar, gregorian calendar
answer type: Calendar System.
auxiliary information: Sunday is the day of the week following Saturday but before Monday. For most Christians, Sunday is observed as a day of worship and rest, holding it as the Lord's Day, the seventh-day of the week and the day of Christ's resurrection. Sunday is a day of rest in most Western countries, part of 'the weekend'. In some Muslim countries and Israel, Sunday is the first work day of the week. According to the Hebrew calendars and traditional Christian calendars, Sunday is the first day of the week, and according to the International Organization for Standardization ISO 8601 Sunday is the seventh and last day of the week. No century in the Gregorian calendar starts on a Sunday, whether its first year is '00 or '01. The Jewish New Year never falls on a Sunday..

What is the calendar system that contains [Sunday]?