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