def print_rangoli(size):
    y = [chr(97+i) for i in range(26)]
    inp = size
    for i in range(2*inp-1):
        temp = [y[abs(inp - 1 - i) + abs(inp - 1 - j)] if (abs(inp - 1 - j) + abs(inp - 1 - i))<= (inp - 1) else  '-' for j in range(2*inp-1)]
        print('-'.join(temp))

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