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)

#include <stdio.h>

int main(void)
{
	char s[10000];
	int n,k,i,j;
	
	scanf("%d %s %d",&n,s,&k);
	
	char rep;
	i=0;
	while(s[i] != '\0'){
		//printf("%d:%c\n",i+1,s[i]);
		if(i == k-1){
			rep = s[i];
			j=0;
			while(s[j] != '\0'){
				if(s[j] != rep){
					s[j] = '*';
				}
				j++;
			}
		}
		i++;
	}
	printf("%s\n",s);
	
	return 0;
}