How to read 5 input file (having completely different format) using Sequential file stage?

In detailed-
I have 5 input files that are completely different formats (the number of columns and metadata are different). How can I read all files using a sequential file stage? When I read the data from each file, how can I confirm which data belongs to which file?
Sincere request, Please suggest for the correct answer. I appreciate any help you can provide.

 

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