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 C (GCC 5.4.1) (judge verdict: Accepted)

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>

int main(void) {
	int n,k;
	char s[11],sp[11];
	char tmp;
	
	scanf("%d",&n);
	scanf("%s",&s);
	scanf("%d",&k);
	
	tmp = s[k-1];
	
	for(int i=0;i<n;i++){
		if(tmp != s[i]) sp[i] = '*';
		else sp[i] = s[i];
	}
	
	sp[n] = '\0';
	
	printf("%s\n",sp);
	
	return 0;
}