| C
> B
> A A B C (reverse) ----------------(subtract) Z Y X X Y Z (reverse) ---------------- (add) 1 0 8 9 (answer) |
| 3
> 2
> 1 1 2 3 (reverse) ----------------(subtract) 1 9 8 8 9 1 (reverse) ---------------- (add) 
(answer) |
| 9
>
7
> 5 5 7 9 (reverse) ----------------(subtract) 3 9 6 6 9 3 (reverse) ---------------- (add)
(answer) |
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| C L O S E |
