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  1. or download this
    use strict;

while (<DATA>) {
...
-$ 500
- $ 60
 + $ 30.
  2. or download this
    Acceptable: '-400' -> -400
Acceptable: '+20,0' -> 200
Acceptable: '-300.02' -> -300
...
Acceptable: '-$ 500' -> -500
Acceptable: '- $ 60' -> -60
Not acceptable: ' + $ 30.' -> 30.