Include an existing letter into and existing document

I'm very new to latex so please forgive me if I'm asking a que开发者_如何学运维stion easily solved. I tried searching all over for an answer but couldn't find one.

I have two existing latex documents, a letter and a report. Is there any simple way to easily include the letter in the report? I know it is possible to compile a pdf version of the letter and to simply include the pdf in the report, but is it possible to do it otherwise?

UPDATE:

I could not find a solution so I ended up compiling the letter to pdf and then including the resultant pdf.

I could not find a solution so I ended up compiling the letter to pdf and then including the resultant pdf.

Try \input{filename} or \include{filename}.