Duplicate the row of data and change the value of variable?

[Feyng819]

If there is a number in var2, and there is a letter in var3, then I would like to add 4 rows of data, and remove the dash symbol in var2 if it appears, like the row of data “ 1 3 C ” I hope to convert it into:

1 . .
1 . C
3 . .
3 . C

If there is a number in var2 with no letter in var3, I would like to add 2 rows of data and remove the dash if it appears. Like the data “ 9 -10 .”,I hope to convert it into:

9 . .
10 . .

Otherwise the data will remain the same.

My data set:
Data have;
Input var1 $ var2 $ var3 $100.;
cards;
1 3 C
4 -5 B
7 . .
9 -10 .
12 . N
Run;

My expected output is:
var1 var2 var3
1 . .
1 . C
3 . .
3 . C
4 . .
4 . B
5 . .
5 . B
7 . .
9 . .
10 . .
12 . N

Thank you!

[ChrisNZ]

Like this?

data HAVE;
  input VAR1 $ VAR2 $ VAR3 $;
cards;
1 3 C
4 -5 B
7 . .
9 -10 .
12 . N
run;

data WANT; 
  set HAVE;
  length V1-V3 $8;
  V1=VAR1; output;
  if VAR3 ne ' ' then do; 
    V3=VAR3; 
    output; 
  end;
  V3=' ';
  if VAR2 ne ' ' then do;
    V1=compress(VAR2,'-');
    output; 
    if VAR3 ne ' ' then do; 
      V3=VAR3; 
      output; 
    end;
  end;
  drop VAR1-VAR3;
  rename V1=VAR1 V2=VAR2 V3=VAR3;
run;

VAR1	VAR2	VAR3
1
1		C
3
3		C
4
4		B
5
5		B
7
9
10
12
12		N