import java.util.Scanner;

public class slavi {
    public static void main(String[] args) {
         Scanner scanner = new Scanner(System.in);

         String alphabet = "abcdefghijklmnopqrstuvwxyz";


        for (int i = 0; i < alphabet.length()  ; i++) {
            
            System.out.println(alphabet.charAt(i));
        }

    }
}