how to create numeric format based on conditions

[noda6003]

I have character variable and for sorting purpose i need to create a numeric variable:

I have plade as character and need something like pladen for numeric sorting. and the issue is the plade is if plade is not in order as mentioned then somehow it scan and look and the last text and create numeric values

plade

pa101

pa102

pa103

pa104

pa105

pa106

pa107

pa108

pa109

pa110

pa111

pa112

pa113

pa114

pa101f

pa102f

pa103f

pa104f

pa105f

pa106f

pa107f

pa108f

pa109f

pa110f

pa111f

pa112f

pa113f

pa114f

pa101e

pa102e

pa103e

pa104e

pa105e

pa106e

pa107e

pa108e

pa109e

pa110e

pa111e

pa112e

pa113e

pa114e

i need numeric variable like the below - any help

plade	pladen
pa101	1
pa102	2
pa103	3
pa104	4
pa105	5
pa106	6
pa107	7
pa108	8
pa109	9
pa110	10
pa111	11
pa112	12
pa113	13
pa114	14
pa101f	101
pa102f	102
pa103f	103
pa104f	104
pa105f	105
pa106f	106
pa107f	107
pa108f	108
pa109f	109
pa110f	110
pa111f	111
pa112f	112
pa113f	113
pa114f	114
pa101e	201
pa102e	202
pa103e	203
pa104e	204
pa105e	205
pa106e	206
pa107e	207
pa108e	208
pa109e	209
pa110e	210
pa111e	211
pa112e	212
pa113e	213
pa114e	214

[PeterClemmensen]

What is the logic here? 

[noda6003]

create a numeric variable if pa101 than 1 and if pas101f than 201 and pa101f than 101 etc. 

[ed_sas_member]

Like this ?

data have2;
	set have;
	i=substr(plade,6,1);
	j=substr(plade,4,2);

data have3 (drop= i j count);
	set have2;
	by i notsorted;
	retain count -1;
	if first.i then count+1;
	pladen = count*100 + j;
run;

[noda6003]

also creates 301,401 and 601 as numbers

[Kurt_Bremser · Accepted solution]

Try this:

data want;
set have;
pladen = input(substr(plade,3,3),3.);
select (substr(plade,6,1));
  when ('f'); /* do nothing */
  when (' ') pladen = pladen - 100;
  when ('e') pladen = pladen + 100;
end;
run;