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 Java7 (OpenJDK 1.7.0) (judge verdict: Runtime Error)

import java.util.*;

class Main
{
  	public static void main(String[] args){
    	Scanner sc = new Scanner(System.in);
  		int n = Integer.parseInt(sc.next());
  		String as= sc.next();
  		char[] s = as.toCharArray();
		int k = Integer.parseInt(sc.next());
  		char[] ans = new char[n];
  		for(int i=0; i<n; i++){
      		if(s[i]!=s[k]){
      			ans[i]='*';		
      		}else{
              ans[i]=s[i];
            }
    	}
      	for(int i=0;i<s.length;i++){
      		System.out.print(ans);  
      	}
    }
	
}