//RecursiveCalls.java

import java.util.Scanner;

public class RecursiveCalls
{
    public static void backwardsAlphabet(char currLetter)
    {
        if (currLetter == 'a')
        {
            System.out.println(currLetter);
        }
        else
        {
            System.out.print(currLetter + " ");
            backwardsAlphabet((char)(currLetter - 1));
        }
    }

    public static void main (String [] args)
    {
        Scanner scnr = new Scanner(System.in);
        char startingLetter;

        startingLetter = scnr.next().charAt(0);

        /* Your solution goes here  */
        backwardsAlphabet(startingLetter);
    }
}