r=range(input()) a=[1j**int((4*i+1)**.5)for i in r] b=[map(int,(-sum(a[:i]).real,sum(a[:i]).imag))for i in r] c,d=zip(*b) for i in range(min(c),max(c)+1):print''.join([i,j]in b and chr(b.index([i,j])%26+65)or' 'for j in range(min(d),max(d)+1))