#include<stdio.h>
int main(){
	int i,j,n;
	scanf("%d",&n);
	for(i=1;i<=n;i++){
		for(j=1;j<=n-i;j++){
			printf("*");
		}
		for(j=1;j<=2*i-1;j++){
			printf("@");
		}
		for(j=1;j<=n-i;j++){
			printf("*");
		}
		printf("\n");
	}

	return 0;
}
/**************************************************************
	Problem: 1494
	User: admin
	Language: C
	Result: Accepted
	Time:13 ms
	Memory:1144 kb
****************************************************************/