import java.util.*;
public class Main{
public static void main(String[] args){
Scanner sc = new Scanner(System.in);
String s = sc.nextLine();
String res = "";
for(int i = 0; i < s.length(); i ++){
res += (char)(s.charAt(i) + s.charAt((i + 1) % s.length()));
}
System.out.println(res);
}
}