# your code goes here
n=int(input())
for i in range(n):
for j in range(i,2*i+1):
print((chr)(65+j), end="")
print()
IyB5b3VyIGNvZGUgZ29lcyBoZXJlCm49aW50KGlucHV0KCkpCmZvciBpIGluIHJhbmdlKG4pOgoJZm9yIGogaW4gcmFuZ2UoaSwyKmkrMSk6CgkJcHJpbnQoKGNocikoNjUraiksIGVuZD0iIikKCXByaW50KCk=