j;
main(){
	int num,i;
	scanf("%d",&num);
	int ges = (num-2)*2+1;
	int empty;
	for (; j < num-1; ++j){
		empty = (ges - (j*2+1))/2;
		for (i=0; i < empty; ++i){
			printf(" ");
		}
		for (i = 0; i < j*2+1; ++i){
			printf("*");
		}
		printf("\n");
	}
	for (i = 0; i < (ges-3)/2; ++i){
		printf(" ");
	}
	printf("G*F");
}