"abc"  ->  "aabbcc"
"uk"   ->  "uukk"
"t"    ->  "tt"
import java.util.Scanner;

class ToCharArrayMethod {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String input = sc.next();

        char[] arr = input.toCharArray();
        char[] arr2 = new char[arr.length * 2];

        for (int i = 0; i < input.length(); i++) {
             arr2[i] = arr[i];
        }

        sc.close();

    }
}