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  1. # your code goes here
  2. n=int(input())
  3. for i in range(n):
  4. for j in range(i,2*i+1):
  5. print((chr)(65+j), end="")
  6. print()
Success #stdin #stdout 0.07s 14060KB
stdin
7
stdout
A
BC
CDE
DEFG
EFGHI
FGHIJK
GHIJKLM