How to get rid of spaces in code?

Question

cmd/bat

Good day.
Tell me please.
there is file a.txt
there is file 1.bat
in file 1.bat the following code:
echo 123456456789;2;1 >>a.txt
as planned, the line 123456456789;2;1 should be written to file a.txt, it is written, but after it a space is formed. How to get rid of the space at the end????

Answer 1

And try to remove the space after the unit?