How many continents have a capital A in their names?

Six of the traditional 7 continents have a capital "A" in their English names.

North America
South America
A
ustralia
Asia
Antarctica
Africa
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Regardless of how one defines a continent, every continent aside from Europe has a capital A in it.

North America
South America
Australia
Antarctica
Africa
Asia

If one chooses to include Central America (normally part of North America or The Americas), it too has a capital A in it.