def print_rangoli(n):
    a = [''] * 27
    for i in range(1, len(a)):
        a[i] = chr(ord('a') + i - 1)

    for i in range(1, n + 1):

        s = ""
        t = 0
        tmp = 0
        while t < i:
            s += str(a[n - t])
            tmp = n - t
            t += 1
        while tmp < n:
            s += a[tmp + 1]
            tmp += 1
        s = list(s)
        s = '-'.join(s)
        s = s.center(4 * n - 3, '-')
        print(s)

    for i in range(n - 1, 0, -1):
        s = ""
        t = 0
        tmp = 0
        while t < i:
            s += str(a[n - t])
            tmp = n - t
            t += 1
        while tmp < n:
            s += a[tmp + 1]
            tmp += 1
        s = list(s)
        s = '-'.join(s)
        s = s.center(4 * n - 3, '-')
        print(s)

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