/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
public class Main
{
    private String[] s;
    private int N = 3;
 
    public Main(int capacity)
    { s = new String[capacity]; }
 
    public boolean isEmpty()
    { return N == 0; }
 
    public void push(String item)
    { s[N++] = item; }
 
    public String pop()
    { 
        return s[--N];
    }
 
    public static void main(String[] args) {
        Main stack = new Main(3);
        System.out.println(stack.pop());
        System.out.println(stack.pop());
        System.out.println(stack.pop());
        System.out.println(stack.isEmpty());
    }
}
 

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