In my upcoming trip across Europe I'm planning to visit the following countries: Germany, Austria, Hungary, Romania, Bulgaria and Greece. Are all of them part of the Schengen area?
Most of them are, but not all. Romania and Bulgaria are the two exceptions.
Instruction: In my upcoming trip across Europe I'm planning to visit the following countries: Germany, Austria, Hungary, Romania, Bulgaria and Greece. Are all of them part of the Schengen area?
Context: 
Response: Most of them are, but not all. Romania and Bulgaria are the two exceptions.