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 Java (OpenJDK 11.0.6) (judge verdict: Accepted)

import java.util.*;
//import java.math.BigInteger;

public class Main {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        String str = sc.next();
        char[] c = str.toCharArray();
        int K = sc.nextInt();
        //int[] p = new int[N];
        //a[0] = Character.getNumericValue(str.charAt(0));
        //boolean test = false;
        
        for(int i=0; i<N; i++){
            if(c[K-1] != c[i]){
                c[i] = '*';
            }
            //System.out.println(count);
        }
        for(int i=0; i<N; i++){
            System.out.print(c[i]);
        }
        System.out.println("");
    }
}