#include <bits/stdc++.h>
using namespace std;
int main(){
    int n,g=1;
    cin>>n;
    for(int i=1;i<=n;i++){
        for(int j=n;j>i;j--) cout<<"*";
        for(int j=1;j<=g;j++) cout<<"@";
        for(int j=n;j>i;j--) cout<<"*";
        g+=2;
        cout<<endl;
    }
}
/**************************************************************
	Problem: 1494
	User: wngjinming
	Language: C++
	Result: Accepted
	Time:11 ms
	Memory:2072 kb
****************************************************************/