#include "bits/stdc++.h"
using namespace std;
#define int long long
#define endl '\n'
#define rep(i, n) for(int i = 0; i < (int)(n); i++)
#define rep2(i,a,b) for(int i=int(a);i<int(b);i++)
#define pb emplace_back
#define all(x) (x).begin(),(x).end()
int mod=1e9+7;
int mod2=998244353;
const int INF=1e9;

signed main(){
	int n,k;
	string s;
	cin>>n>>s>>k;
	k--;
	rep(i,n){
		if(s[k]==s[i])cout<<s[k];
		else cout<<"*";
	}
	cout<<endl;
}

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