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: Wrong Answer)

#include <stdio.h>

int main(void){
	int n;
	scanf("%d",&n);
	char s[n+1];
	scanf("%s",s);
	int lw = 0,rb = 0;
	for(int i = 0;(s[i] == '.')&&(i < n);i++){lw++;}
	for(int i = n-1;(s[i] == '#')&&(i >= 0);i--){rb++;}
	int w = 0,b = 0;
	for(int i = lw;i < (n - rb);i++){
		if(s[i] == '.'){w++;}
		else{b++;}
	}
	if(w < b){printf("%d",w);}
	else{printf("%d",b);}
	
	return 0;
}