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>
#include<math.h>
#include<stdlib.h>
#include<string.h>
#include<stdbool.h>

#define MOD 998244353

#define MIN(a,b) ((a)<(b)?(a):(b))
#define MAX(a,b) ((a)>(b)?(a):(b))

typedef long long int64;

int main(void){

    int N;
    scanf("%d",&N);
    
    char S[N];

    
    scanf("%s",S);
    

    int K;

    scanf("%d",&K);
    
    
    char s=S[K];

    for(int i = 0; i < N; i++)
    {
        if(S[i]!=s){
            S[i]='*';
        }
    }

    for(int i = 0; i < N; i++)
    {
        printf("%c",S[i]);
        
    }

    
    
    
    return 0;
}