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;

public class Program
{
    public static void Main()
    {
        int Word_Length=int.Parse(Console.ReadLine());
        var line=Console.ReadLine();
        int num=int.Parse(Console.ReadLine())-1;
        
        var j=0;
        for(var i=0;i<Word_Length;i++){
            if(line[i]!=line[num])j=1;
            else j=2;
            
            if(j==1)Console.Write("*");
            else Console.Write(line[num]);
            
            j=0;
            
        }
        Console.WriteLine();
    }
}