#include <set>
#include <iostream>
#include <string>
using namespace std;
template <class T>
void print(T& c){
for( typename T::iterator i = c.begin(); i != c.end(); i++ ){
std::cout << *i << endl;
}
}
int main()
{
set<string> first;
first.insert("A");
first.insert("B");
first.insert("C");
cout << first.size() << endl;
set<string> second (first); // Copy constructor
second.insert("I");
second.insert("S");
second.insert("C");
set<string> third = first;
print(first);
print(second);
print(third);
}
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