how to make knime read only the first lines of a pdf

I am new to using knime. I would like knime to read only the first lines of a pdf document such as a paper. Can anyone help me?

Hi @monica_rosciano
I think this can help you:

Dear Rahimi,thanks for your suggest, but I didn’t make myself clear. My problem is to want to read only the title and the abstract lines of some essays in pdf. I don’t need all the contents of the pdf but only a part of it, but I don’t know how many lines it consists of.
How could I do?