Dear All,
Could you please help me in writing the code that will delete all signs following first 18 signs:

I have a column of text rows:

sadjnsjkhfjsdfhadfagagghgh\
fgdagshs hgjzfgaf nghhhf


I need a macro which will change the above text into an 18 signs long text:

sadjnsjkhfjsdfhadf
fgdagshs hgjzfgaf


I would really appreciate your help.
Thank you in advance.