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 PHP (5.6.30) (judge verdict: Wrong Answer)

<?php
fscanf(STDIN, "%d",$cnt);
fscanf(STDIN, "%s",$moji);
fscanf(STDIN, "%d",$ban);

$t=substr($moji,$ban,1);
$m="";
for($i=0;$i<$cnt;$i++){
	//echo substr($moji,$i-1,1)."\n";
	
	if(substr($moji,$i,1)<>$t){
		$m=$m."*";
		//str_replace(substr($moji,$i-1,1),"*",$moji);
	}else{
		$m=$m.substr($moji,$i,1);
	}
}

echo $m;
?>