#include <iostream>
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: admin
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/