#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<=2*i-1;j++) cout<<"@";
        for(j=1;j<=n-i;j++) cout<<"*";
        cout<<endl;
    } 
}
/**************************************************************
	Problem: 1494
	User: huanglingkai
	Language: C++
	Result: Accepted
	Time:12 ms
	Memory:2072 kb
****************************************************************/