import java.util.Scanner;

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

        int r = scanner.nextInt();
        int c = scanner.nextInt();

        String [][] palindromes = new String[r][c];

        for (int row = 0; row <r ; row++) {
            for (int col = 0; col <c ; col++) {
                String elementToAdd = findCurrentElement(row,col);
                palindromes[row][col] = elementToAdd;
            }
        }
        printMatrix(palindromes);
    }

    private static void printMatrix(String[][] palindromes) {
        for (int row = 0; row <palindromes.length ; row++) {
            for (int col = 0; col <palindromes[row].length ; col++) {
                System.out.print(palindromes[row][col] + " ");
            }
            System.out.println();
        }
    }

    private static String findCurrentElement(int r, int c) {
        StringBuilder sb = new StringBuilder();
        sb.append((char) ('a' + r));
        sb.append((char) ('a' + r + c));
        sb.append((char) ('a' + r));

        return sb.toString();
    }
}