Is there anybody willing to give me an input file example ?

First, you are strongly recommended to read the "New Users Guide" (~ABINIT/Infos/new_user_guide.html) and try Tutorials, before you case is set up.
Then, you can find input files in Tutorials and Test_* similar with your case, and use them as template. (Please read "README" files, then you will find ...)
Please be aware that parameters relevant for convergence (energy cutoff, k-points, nstep, ntime, etc.) should be carefully checked for physically/chemically meaningful results.