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import java.util.*;
public class stack
{
private List list=new ArrayList();
private int index=0;
public void push(Object obj)
{
list.add(index,obj);
index++;
}
public Object pop()
{
index--;
return list.get(index);
}
}
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import java.util.Scanner;
public class _calendar {
public static void main(String[] args) {
// TODO Auto-generated method stub
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