#include<bits/stdc++.h>
using namespace std;
int main(){
   int n,i,j;
   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: chenyaohuo
	Language: C++
	Result: Compile Error
****************************************************************/