import java.util.*;
class Pair{
private final T first;
private final S second;
public Pair(T f, S s) {
first = f;
second = s;
}
public T getFirst() {
return first;
}
public S getSecond() {
return second;
}
public String toString() {
return "(" + first.toString() + ", " + second.toString() + ")";
}
}
class GenericPairs0 {
public void printLines(List strings) {
for (String s: strings) {
System.out.println( s );
}
}
public void printObjects(List objects) {
for (Object s: objects) {
System.out.println( s );
}
}
public static void main(String[] args) {
Pair first = new Pair("hello", "world");
System.out.println( first.toString() );
}
}