A counterfeit currency printer is operating in country XYZ, and all of the banks must try to identify the bad currency. Every note has a serial number that can be used to determine whether it is valid. The serial number also can be used to determine the denomination of the notes. A valid serial number will have the following characteristics: 1. There are 10 to 12 characters
2. The first 3 characters are distinct uppercase English letters
3. The next 4 characters represent the year the note was printed and will always be between 1900 and 2019 inclusive.
4. The next characters represent the currency denomination and may be any one of (10.20, 50, 100, 200, 500, 1000)
5. The last character is an uppercase English letter.

Determine the value of the valid currency.