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++14 (GCC 5.4.1) (judge verdict: Accepted)

#include <bits/stdc++.h>
 
#define INF 100100100
#define MOD 1000000007
 
using namespace std;
using ll = long long;
using ull = unsigned long long ;
 
int main(){
   int N, K;
   string S;
   cin>>N>>S>>K;
   
   for(int i=0; i<N; i++) {
       if(S[K-1]!=S[i]) {
           S[i] = '*';
       }
   }
   
   cout<<S<<endl;

    return 0;
}