import java.util.Scanner;

public class eLexam06_SafePasswordsGenerator {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int aX = Integer.parseInt(scanner.nextLine());
        int bY = Integer.parseInt(scanner.nextLine());
        int maxNumberPass = Integer.parseInt(scanner.nextLine());
        int A = 35;
        int B = 64;
        int counter = 0;

        for (int j = 1; j <= aX; j++) {
            for (int k = 1; k <= bY; k++) {

                counter++;
                if (counter > maxNumberPass) {
                    break;
                }

                System.out.print((char) A);
                System.out.print((char) B);
                System.out.print(j);
                System.out.print(k);
                System.out.print((char) B);
                System.out.print((char) A);
                System.out.print("|");

                if (A >= 55) {
                    A = 35;
                } else {
                    A++;
                }

                if (B >= 96) {
                    B = 64;
                } else {
                    B++;
                }
            }
        }
    }
}