std::cout << "Stack:" << std::endl;

std::cout << st.size() << " " << st.empty() << std::endl;

std::cout << st << std::endl;

std::cout << "END OF OUTPUT! \n" << std::endl;

stack st1;

output(st1);

for (int i = 11; i < 100; i = i + 11) {

st1.push(i);

}

output(st1);

for (int i = 100; i < 1000; i = i + 100) {

st1.push(i);

}

output(st1);

stack st2 = st1;

stack st3 = {123, 234, 345, 456, 567, 678, 789};

stack st4(st3);

output(st2);

output(st3);

output(st4);

st1.clear();

for (int i = 0; i < 5; i++) {

std::cout << st2.peek() << " ";

st3.push(st2.peek());

st2.pop();

}

std::cout << std::endl;

output(st1);

output(st2);

output(st3);

output(st4);