#include<stdio.h>
n;k;i;j;l;main(){scanf("%d",&n);for(;i<n-1;i++){for(k=(n-i-3);k>=0;k--)printf(" ");for(j=0;j<1+i*2;j++)printf("*");printf("\n");}for(;l<=((n-3)*2-2)/2;l++)printf(" ");printf("G*F\n");}