public class TestStack {

public static void test(Stack s) {

Stack tmp;

tmp = new LinkedStack();

while (! s.isEmpty()) {

tmp.push(s.pop());

}

s = tmp;

}

public static void main(String[] args) {

Stack s;

s = new LinkedStack();

s.push("A");

s.push("B");

s.push("C");

s.push("D");

System.out.println("before:");

System.out.println(s);

test(s);

System.out.println("after:");

System.out.println(s);

}

}

Complete the print out resulting from the execution of the code above. before:

[A,B,C,D] <- top