def print_rangoli(number):
    total_rows = []
    for i in range(1,(number+1)):
        row_length = i
        descending_part = [chr(96 + number - j) for j in range(row_length)]
        rows = descending_part + descending_part[-2::-1]
        total_rows.append("-".join(rows))
    max_width = len(total_rows[-1])
    for k in total_rows:
        print(k.center(max_width,"-"))
    for k in reversed(total_rows[:-1]):
        print(k.center(max_width,"-"))

def build_line(size, idx):
    line = ""
    spacer_len = ((size - (idx+1)) * 2)
    line += "-" * spacer_len
    letters = []
    for j in range(idx + 1):
        letters += ALPHABET[(size-1)-j]
    for k in range(idx - 1, -1, -1):
        letters += ALPHABET[(size-1)-k]
    line += "-".join(letters)
    line += "-" * spacer_len
    return line

def print_rangoli(size):
    for i in range(size):
        print(build_line(size, i))
    for i in range(size - 2, -1, -1):
        print(build_line(size, i))

    # your code goes here
    a=0
    for i in range(1, n*2):
        mid = (n*4-2)//2
        if i<n:
            k = (n*4-3)-(i*2-1)
            asc=97+(n-1)
            for j in range(1,k+1):
                if(j>=mid-a and j<=(k+2)/2):
                    print(chr(asc)+"-", end="")
                    temp = asc
                    asc -= 1
                elif(j>(k+2)/2 and j<=mid):
                    temp += 1
                    print(chr(temp)+"-", end="")
                else:
                    print("-", end="")
            a += 2
            print()
        elif i==n:
            asc = 97+(n-1)
            for j in range(1,(n*4-2)):
                if j<=mid:
                    if j%2==0:
                        print("-", end="")
                    else:
                        print(chr(asc), end="")
                        temp=asc
                        asc -= 1
                else:
                    if j%2==0:
                        print("-", end="")
                    else:
                        temp += 1
                        print(chr(temp), end="")
            print()
        else:
            a -= 2
            asc=97+(n-1)
            k2 = (i*2)-2
            for j in range(1,k2+1):
                if(j>=mid-a and j<=(k2+2)/2):
                    print(chr(asc)+"-", end="")
                    temp = asc
                    asc -= 1
                elif(j>(k2+2)/2 and j<=mid):
                    temp += 1
                    print(chr(temp)+"-", end="")
                else:
                    print("-", end="")
            print()

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

    ord_a = 97
    lines = []
    ord_last_char = size + ord_a - 1
    for num_chars in range(1, size + 1):
        left_str_list = [chr(ord_char) for ord_char in range(ord_last_char, ord_last_char - num_chars, -1)]
        string = '-'.join(left_str_list + left_str_list[-2::-1])
        line = string.center(4 * size - 3, '-')
        lines.append(line)
        print(line)

    for idx in range(len(lines) - 2, -1, -1):
        print(lines[idx])