main(){char r[9];scanf("%s",&r);int n=atoi(r);int j;int i;for(i=0;i<n-1;i++){for(j=0;j<n-2-i;j++){printf(" ");}for(j=0;j<i*2+1;j++){printf("*");}printf("\n");}for(j=0;j<n-3;j++){printf(" ");}printf("G*F\n");}