#include <iostream>
using namespace std;

int main() {
    int n;
    cin >> n;

    for (int i = 1; i <= n; ++i) {
        // 左侧的 *
        for (int j = 1; j <= n - i; ++j) {
            cout << "*";
        }
        // 中间的 @
        for (int j = 1; j <= 2 * i - 1; ++j) {
            cout << "@";
        }
        // 右侧的 *
        for (int j = 1; j <= n - i; ++j) {
            cout << "*";
        }
        cout << endl;
    }

    return 0;
}