output_description: Print the string obtained by replacing every character in S that differs from
  the K-th character of S, with `*`.
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      N
      S
      K
attempt: N = int(input())
  S = input()
  K = int(input())
  O = [
      "a",
      "b",
      "c",
      "d",
      "e",
      "f",
      "g",
      "h",
      "i",
      "j",
      "k",
      "l",
      "m",
      "n",
      "o",
      "p",
      "q",
      "r",
      "s",
      "t",
      "u",
      "v",
      "w",
      "x",
      "y",
      "z",
  ]
  if S.islower():
      if len(S) == N:
          if 1 <= K <= N <= 10:
              W = str(S[K - 1])
              O.remove(W)
              for i in range(24):
                  S = S.replace(O[i], "*")
  print(S)
  
problem_description: Statement
  
  You are given a string S of length N consisting of lowercase English letters,
  and an integer K. Print the string obtained by replacing every character in S
  that differs from the K-th character of S, with `*`.
samples: [{"input": "5\n    error\n    2", "output": "*rr*r\n    \n\nThe second character of S is `r`. When we replace every character in `error`\nthat differs from `r` with `*`, we get the string `*rr*r`.\n\n* * *"}, {"input": "6\n    eleven\n    5", "output": "e*e*e*\n    \n\n* * *"}, {"input": "9\n    education\n    7", "output": "******i**"}]