# Topic: Pttern Lecture-3
#Question: Code 1
# With Constraints ( 0 <= N <= 13 )
n = int(input())
if 0<=n<=13:
for i in range(n):
for j in range(i, 2*i+1):
print(chr(j+65), end=" ")
print()
else:
print("Print Enter Number Between 0 to 13")
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