Character Combinations

import java.util.Scanner;

public class SoftUni {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = Integer.parseInt(sc.nextLine());

        for(int first = 97;first < 97 + n;first++){
            for(int second = 97;second < 97 + n;second++){
                for(int third = 97;third < 97 + n;third++){

                    System.out.println((char)first + "" + (char)second + "" + (char)third);
                }
            }
        }

    }

}