#include<bits/stdc++.h>
using namespace std;
int main(){
    int i,j,n;
    cin>>n;
    for(i=1;i<=n;i++){
        for(j=1;j<=n-i;j++){
            cout<<"*";
        }
        for(j=1;j<=i*2-1;j++){
            cout<<"@";
        }
        for(j=1;j<=n-i;j++){
            cout<<"*";
        }
        cout<<endl;
    }
    return 0;
}
/**************************************************************
	Problem: 1494
	User: lijinkai
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/