import java.util.Arrays;
import java.util.Scanner;

public class EX03_Str {
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		System.out.print("enter a message:");
		String msg = in.nextLine();
		// length
		int len = msg.length();
		System.out.printf("msg=[%s], len=%d\n", msg, len);
		// charAt
		for (int k = len - 1; k >= 0; k--) {
			System.out.printf("%c", msg.charAt(k));
		}
		System.out.println();
		// toCharArray
		char[] cmsg = msg.toCharArray();
		// Arrays.sort
		Arrays.sort(cmsg);
		// String smsg = new String(cmsg);
		System.out.println(cmsg);
	}
}