String data to Sign data

I am using a device where I receive a string data output which has a meaning.
For example:
:000000 -0067U 0004 -0578
:000000 -0067U 0004 -0578
:000000 -0066U 0004 -0579
:000000 -0066U 0003 -0579
:000000 -0066U 0003 -0580
I need to extract the 9th and 11th character through a string subset.
I have a question, please the attached VI:
1. Is it correct extraction method? any other suggestion?
2. The 9th character actually is the sign of character 11 i.e +(if space) and - (is shown as minus)
Then I have to take this number for e.g -5 or +5 then use in another calculation but problem is how can I convert the _ and + from string to the number? then how can I make the 9th and 11th character as one number.
Attachments:
string.vi ‏14 KB

Maybe the last part can be simplified. Please see the image.
I modified your input a little bit since your data only contained "minus". I changed row 2 to have a "space" which should be interpreted as positive sign. Moreover, row 4 shows a explicit "plus" sign in the ninth position. Note that both space and plus are correctly interpreted as positive.
Consider sanitizing the input. The 0th-row with "-0587" does not follow the syntax of all the other rows so it should be removed.
Regards,
Attachments:
Solution.PNG ‏24 KB

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