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 Java8 (OpenJDK 1.8.0) (judge verdict: Runtime Error)

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
    public static void main(String... args) {
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
        int N = 0;
        String S = "";
        int K = 0;
        try {
            N = Integer.parseInt(bufferedReader.readLine());
            S = bufferedReader.readLine();
            K = Integer.parseInt(bufferedReader.readLine());
        } catch (IOException e){
            e.printStackTrace();
            return;
        }

        char c = S.charAt(K);
        System.out.println(S.replaceAll("[^" + c + "]", "*"));
    }
}