What will be the output of the following C++ code?

#include <iostream>
#include <string>
#include <cstdlib>
using namespace std;
template<class T>
class A
{
	T a;
    public:
	A(){}
	~A(){}
};
 
int main(int argc, char const *argv[])
{
	A <char>a1;
	A <int>a2;
	A <double>a3;
	cout<<sizeof(a1)<<endl;
	cout<<sizeof(a2)<<endl;
	cout<<sizeof(a3)<<endl;
	return 0;
}