public class DoubleString {

    static String StringDouble( int ind, String str ) {
        System.out.print(str.charAt(ind));
        System.out.print(str.charAt(ind));
        if( ind == str.length() ) return "";
        else{
            return str.charAt(ind) + StringDouble( ind+1, str );
        }
    }
    public static void main(String[] args) {
        // TODO code application logic here
        Scanner in = new Scanner(System.in);

        String str;

        str = in.nextLine();

        //newStr = RemoveVowels(0, str);

         StringDouble(0,str);
    }

}