# your code goes here
n=int(input())
for i in range(n):
for j in range(i+1):
print(chr(65+i), end="")
print()
IyB5b3VyIGNvZGUgZ29lcyBoZXJlCm49aW50KGlucHV0KCkpCmZvciBpIGluIHJhbmdlKG4pOgoJZm9yIGogaW4gcmFuZ2UoaSsxKToKCQlwcmludChjaHIoNjUraSksIGVuZD0iIikKCXByaW50KCk=