import string
alph = list(string.ascii_lowercase)

def print_rangoli(size):
    

    n = size

    my_list = []

    for i in range (n-1,-1,-1):
  
        #add elements to my_list
        my_list.append(alph[i])

        #revese list
        rev_list = list(reversed(my_list))


        #create new list by join my_list & rev_list
        new_list = my_list + rev_list[1:]

        #print from top row to middle row
        print(("-".join(new_list)).center((size*2 -1)*2 - 1,'-'))

    for i in range (n-1,0,-1):
        #remove last element in the my_list
        my_list.pop()

        #revese list
        rev_list = list(reversed(my_list))


        #create new list by join my_list & rev_list
        new_list = my_list + rev_list[1:]

        #print from middle row to last row // PS: without middle row
        print(("-".join(new_list)).center((size*2 -1)*2 - 1,'-'))



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

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)