#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n,j,i;
	cin>>n;
	for(i=1;i<=n;i++){
		for(j=0;j<n-i;j++){
			cout<<"*";
		}
		for(j=0;j<i*2-1;j++){
			cout<<"@";
		}
		for(j=0;j<n-i;j++){
			cout<<"*";
		}
		cout<<endl;
	}
	return 0;
}

/**************************************************************
	Problem: 1494
	User: zzz
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/