def print_rangoli(size):
    # your code goes here
    a = ord('a')
    alphabet = [chr(a + i) for i in range(size)]
    length_center = (((size * 2) - 1) * 2) - 1
    rangoli = ""
    for i in range(size-1, -1, -1):
        right_side = alphabet[i:]
        left_side = right_side[::-1][:-1]
        line = left_side + right_side
        rangoli += f'{"-".join(line).center(length_center, "-")} \n'

    for i in range(1, size):
        right_side = alphabet[i:]
        left_side = right_side[::-1][:-1]
        line = left_side + right_side
        rangoli += f'{"-".join(line).center(length_center, "-")} \n'

    print(rangoli)

if __name__ == '__main__':
    n = int(input())
    print_rangoli(n)