import java.util.*;
public class Driver{
ArrayList<String> a = new ArrayList<String>();
ArrayList<String> b = new ArrayList<String>();
long t = System.currentTimeInMillis();
public void Add1(){
while (a.length < 1000){
a.add("");
}
}
public void Add2(){
while (b.length < 1000){
b.add("");
}
}
public ArrayList reverse(){
ArrayList<String> ans;
int i = 0;
while (ans.length < a.length){
ans.add(a.get(i));
i++;
}
return ans;
}
public static void main(String[] args){
}
}