77 byte Christmas Present in C64 Basic

Author: Serato / Finnish Gold
Category: Christmas Challenge
System:   C64
Language: C64 Basic V2
Len source code: 107
Len exe file:    79
Len code only:   77
Instructions:
Load BOX.PRG into emulator
Description:
The first line is printed directly, using SPC() to indent.
The rest of the box is calculated implicitly by iterating X and Y from -9 to 9
and testing each for = 9 * SGN(). These boolean results are combined with
boolean and math operators to form a result from 1-4. This selects a character
using MID$("-+ !").
The original submission of this PRG had an extraneous $a on the end of the file
so the reported file size was incorrect.