#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; 
		} 
		
		} 
		
	
	
	
	
	
	
	
	
	
	
	 
/**************************************************************
	Problem: 1494
	User: zhuangwenya
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/