Problem:
Score : 200 points

Problem 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 *.

Constraints

1 \leq K \leq N\leq 10

S is a string of length N consisting of lowercase English letters.

N and K are integers.

Input

Input is given from Standard Input in the following format:

N
S
K

Output

Print the string obtained by replacing every character in S that differs from the K-th character of S, with *.

Sample Input 1

5
error
2

Sample Output 1

*rr*r

The second character of S is r. When we replace every character in error that differs from r with *, we get the string *rr*r.

Sample Input 2

6
eleven
5

Sample Output 2

e*e*e*

Sample Input 3

9
education
7

Sample Output 3

******i**

Solution in C++14 (GCC 5.4.1) (judge verdict: Wrong Answer)

#include <iostream>
#include <iomanip>
#include <vector>
#include <algorithm>
#include <cstdint>
#include <cmath>
#include <numeric>
#include <functional>
#include <queue>
#include <stack>
#include <string>

using namespace std;

int main()
{

  int n;
  string s;
  int k;
  cin >> n;
  cin >> s;
  cin >> k;

  char c = s[k];

  for(int i = 0;
      i < n;
      ++i)
    {
      if(s[i] != c)
        {
          s[i] = '*';
        }
    }

  cout << s << endl;

  return 0;
}