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I will arrive Austria from Tel Aviv in August as a tourist, stay there for a couple of days, then take the train from Vienna to Zagreb, stay for a couple of days in Croatia the take a train from Zagreb to Zurich, 3days there and back to Vienna as my exit point back to Tel Aviv. My questions is, do I need to apply for multiple entry or single entry Schengen Visa since I will enter and left Austria to non-Schengen country and enter again from a Schengen country?