from string import ascii_lowercase

def print_rangoli(size):
    alphas = list(reversed(ascii_lowercase[:size]))
    
    for i in range(1, size+1):
        print("-".join(alphas[0:i] + \
        list(reversed(alphas[0:i]))[1:]).center((size*2 -1)*2 - 1, "-"))
    for i in range(size-1, 0, -1 ):
        print("-".join(alphas[0:i] + \
        list(reversed(alphas[0:i]))[1:]).center((size*2 -1)*2 - 1, "-"))
    

def print_rangoli(size):
    x=[]
    for i in range(size,0,-1):
        l=[]
        for j in range(size,i-1,-1):
            l.append(chr((j-1)+97))
        if len(l)>1:
            l=l+l[-2::-1]
        x.append(("-".join(l).center((2*(2*size-1)-1),'-')))
    x=x+x[-2::-1]
    for b in x:
        print(b)

def print_rangoli(size):

    hyphen = '-'
    final_list = []

    for i in range(size, 0 , -1):

        
        temp = [chr(96 + j) for j in range(size,i-1,-1)]
        alphabets = temp + temp[-2::-1]

        final_list.append(str((hyphen *((i -1) * 2))+"-".join(alphabets)+(hyphen *((i -1) * 2))))

    print(*final_list, sep = "\n")
    print(*final_list[-2::-1], sep = "\n")

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)