The input number of one function

New to Julia
4

For example,I have such a function:

function A(file1,file2,file3,img1,img2,img3,...)
# I need to known how many pictures and files it should be offered. 
   if (nargin < 6)
      file1->img1
      file1<-img2
   end
   if (nargin <10)
      file1->img1
      file1<-img2
      file2->img3
      file2<-img4
   end
...
end