# Topic: Pttern Lecture-2
#Question: Code 3 (Constraints 0 <= N <= 26)
n = int(input())
if 0 <= n <= 26:
for i in range(n):
for j in range(i+1):
print(chr(65+i), end=" ")
print()
else:
print("Please Enter Number between 0 to 26")
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