#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include <bits/stdc++.h>
#define LL long long
const int N = 1e5 + 10;
const int INF = 0x3f3f3f3f;
using namespace std;
int main(){
int n;
cin>>n;
for(int i=1;i<=n;i++){
for(int j=i;j<=n-1;j++)cout<<"";
for(int j=1;j<=n;j++)cout<<"@";
cout<<endl;
}
return 0;
}