def build_row(i, size):
    left = [chr(96 + size - k) for k in range(i + 1)]
    right = [chr(96 + size - k) for k in range(i - 1, -1, -1)]
    return "-".join(left + right).center(size * 4 - 3, "-")

size = int(input())
rows = [build_row(i, size) for i in range(size)]
print("\n".join(rows + rows[-2::-1]))

def print_rangoli(size):
    realist = []
    for j in range(size-1, -1, -1):
        strs,rev = "",""
        for i in range(j,size):
            strs += chr(97 + i)
        if len(strs) > 1:
            rev = strs[::-1]
        realist.append(("-".join(rev[:len(rev)-1] + strs)).center((size * 4) - 3, "-"))

    print(*realist, sep='\n')
    realist.pop()
    realist.reverse()
    print(*realist, sep='\n')