/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		String a[] = {"Uno","Dos",null,null};
		String s = null;
		for(int i=0;i<a.length && a[i]!=null;i++){
			s = a[i];
		}
		System.out.println(s);
	}
}