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.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int a = sc.nextInt();
        String b = sc.next();
        int c = sc.nextInt();

        String[] s = new String[a];

        int i;


        for(i=0;i < a;i++)
            s[i]=b.substring(i,i+1);

        String d = s[c-1];

        for(int j=0;j+1 <= a;j++){
            if(s[j].equals(d)){
                s[j]=s[j];
            }else{
                s[j]="*";
            }

        }

        String e = Arrays.toString(s);
        String f = e.replace(",","");
        String g = f.replace("[","");
        String h = g.replace("]","");
        String l = h.replaceAll(" ","");

        System.out.println(l);
    }
}