/* 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
	{
		// your code goes here
String command = ReadString();
   String words[]=new String[4];
   String[] n = command.split(" ");
 
   for(int i=0; i< 4; i++)
    {
      if((n.length-1)==i)
      {
         words[i]=n[i];
      }
      else
      {
         words[i]="empty";
      }
    }
System.out.println(words[1]);
	}
 
			static String ReadString() {
        Scanner scan = new Scanner(System.in);
        return scan.nextLine();
    }
}

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