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: Accepted)

import java.util.*;

class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
            int N = sc.nextInt();
            String S = sc.next();
            int K = sc.nextInt();
        sc.close();
        
        String[] text = new String[N];
        for (int i = 0; i < N; i++) {
            text[i] = String.valueOf(S.charAt(i));
        }
        
        String rep = text[K-1];

        String ans = "";
        for (int i = 0; i < N; i++) {
            if(!rep.equals(text[i])){
                text[i] = "*";
                ans = ans + text[i];
            }else{
                ans = ans + text[i];
            }
         }

         System.out.println(ans);

    }
}