Show the output of the following code:
```
#include
using namespace std;
class A
{
public:
int x;
int y;
int z;
A(): x(1), y(2), z(3)
{
}
};
int main()
{
A a;
cout << a.x << " " << a.y << " " << a.z;
return 0;
}
```
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