06. Triples of Latin Letters

import java.util.Scanner;

class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = Integer.parseInt(scanner.nextLine()) + 97;

        for (int a = 97; a < n; a++) {
            for (int b = 97; b < n; b++) {
                for (int c = 97; c < n; c++) {
                    System.out.printf("%c%c%c\n", a, b, c);
                }
            }
        }
    }
}

OR:

import java.util.Scanner;

class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = Integer.parseInt(scanner.nextLine()) + 97;

        for (int a = 'a'; a < n; a++) {
            for (int b = 'a'; b < n; b++) {
                for (int c = 'a'; c < n; c++) {
                    System.out.printf("%c%c%c\n", a, b, c);
                }
            }
        }
    }
}

OR:

import java.util.Scanner;

class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        char n = (char)(Integer.parseInt(scanner.nextLine()) + 97);

        for (char a = 'a'; a < n; a++) {
            for (char b = 'a'; b < n; b++) {
                for (char c = 'a'; c < n; c++) {
                    System.out.printf("%c%c%c\n", a, b, c);
                    //System.out.printf("%s%s%s\n", a, b, c);
                }
            }
        }
    }
}