I did it like you said but by changing the numbers in words (1 --> one) didn't do the trick so I tried it with adding zero's and that worked just fine.

Maybe worth saying that if you wan't to sort out numbers by adding zero's you have to add as many zero's as the largest number counts:

Example:

If the largest number is 99 then you add before 1 to 9, 1 zero (01,02,03,04,05,06,...)
If the largest number is 999 then you add before 1 to 9, 2 zero's (001,002,003,004,005,...) and before 10 to 99, 1 zero (010,011,012,...,097,098,099)
and so on...

Anyway thanks FerJo for the reply, it was very helpfull in my search for the solution...

Greetings Crasher