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# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;
using System.Collections.Generic;
using System.Linq;

namespace T1PBC2019B
{
    class MainClass
    {

        static int[] s;
        static int[] n;

        public static void Main(string[] args)
        {
            
            s = Array.ConvertAll(Console.ReadLine().Split().ToArray(), int.Parse);
            string str = Console.ReadLine();
            n = Array.ConvertAll(Console.ReadLine().Split().ToArray(), int.Parse);

            char c = str[n[0]-1];
            string ans = "";
            for(int i = 0; i < s[0]; i++)
            {
                if (str[i] == c)
                {
                    ans += c;
                }
                else
                {
                    ans += '*';
                }
            }
            Console.WriteLine(ans);
        }
    }
}