n;z;s;b;a;main(){scanf("%d",&n);n=(n-1)*2;b=n;for(a=1;a<n;a+=2){for(z=0;z<b/2-1;z++)printf(" ");for(s=0;s<a;s++)printf("*");puts("");b-=2;}printf("%*c",n/2-2,' ');puts("G*F\n");}