# 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)