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) throws Exception {
		Scanner $ = new Scanner(System.in);
		int N = $.nextInt(), K = 0;
		String S = $.next(), s = "";
		K = $.nextInt();
		s = S.substring(K - 1, K);
		for (int i = 0; i < N; i++){
			String Judge = S.substring(i, i + 1);
			if (Judge.equals(s))  System.out.print(Judge);
			else System.out.print("*");
		}
		System.out.println();
		/*
		5 error 2 -> *rr*r
		6 eleven 5 -> e*e*e*
		9 education 7 -> ******i**
		*/
	}
}