output_description: Print the string S after lowercasing the K-th character in it.
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      N K
      S
attempt: num, loc = map(int, input().split())
  dummy = ["" for i in range(num)]
  moj = input()
  count = 0
  for j in moj:
      dummy[count] = j
      count = count + 1
  S = dummy[loc - 1]
  W = S.swapcase()
  dummy[loc - 1] = W
  print(dummy)
  
problem_description: Statement
  
  You are given a string S of length N consisting of `A`, `B` and `C`, and an
  integer K which is between 1 and N (inclusive). Print the string S after
  lowercasing the K-th character in it.
samples: [{"input": "3 1\n    ABC", "output": "aBC\n    \n\n* * *"}, {"input": "4 3\n    CABA", "output": "CAbA"}]