confused

n = int(raw_input())
for i in range(n):
    s = "-".join(chr(ord('a')+n-j-1) for j in range(i+1))
    print((s+s[::-1][1:]).center(n*4-3, '-'))

for i in range(n-1):
    s = "-".join(chr(ord('a')+n-j-1) for j in range(n-i-1))
    print((s+s[::-1][1:]).center(n*4-3, '-'))