import javax.swing.JOptionPane;

public class Invertita {
   public static void main(String[] args) {
	String a = JOptionPane.showInputDialog("Inserire stringa");
	int lung = a.length();
	String invertita = "";
	for(int i=0; i<= lung-1; i++)
 	  invertita= a.substring(i, i+1)+invertita ;
	
	System.out.println(a+invertita);
	System.exit(0);
	}
}