A simple python script (preferably bioinformatics)

I need a Python script to compare two input files that will look like the [login to view URL] and [login to view URL] to produce an [login to view URL] file. Step 1: - First, delete each odd line in an input file, creating a stack of lines, where each line contains only these letters: A, G, C, T and -: For example, if an input file contains four lines: >Blablabla1 ATTA- >Blablabla2 TTT-T Then the output will look like: ATTA- TTT-T - Second, go letter by letter and calculate the content for column In our example, the stack of lines: ATTA- TTT-T Will be transformed into this table: Position, A(%), T(%), G(%), C(%), -(%) 1, 50, 50, 0, 0, 0 2, 0, 100, 0, 0, 0 3, 0, 100, 0, 0, 0 4, 50, 0, 0, 0, 50 5, 0, 50, 0, 0, 50 Step 2: When both input files are converted into their corresponding “content tables”, the script should subtract one of these tables from another to create a “difference content table”. For example, if the first content table looks like this: Position, A(%), T(%), G(%), C(%), -(%) 1, 50, 50, 0, 0, 0 2, 0, 100, 0, 0, 0 And the second one looks like this, Position, A(%), T(%), G(%), C(%), -(%) 1, 50, 50, 0, 0, 0 2, 0, 50, 0, 50, 0 Then, the resulting table will look like this: Position, A(%), T(%), G(%), C(%), -(%) 1, 0, 0, 0, 0, 0 2, 0, 50, 0, -50, 0 This resulting table should be saved as a [login to view URL] file. Hope this is clear