Shell Programming and Scripting

Hi all,
I am new to shell scripting. And I have a task to do, I tried all possible ways to solve this, but didn't. Iwas wondering maybe someone could help me.

So I have a random file something like this

Andrew John Mike
Alfa Omega Beta

And I need to create scrip witch would filter any file like this:
- Find two most repeated symbols in file ( in this file I think it would be "a")
- Find most repeated line end in this file
- And symbol combination, witch is not in combination of symbols witch i entered
like this "joh"
And write all these to new file
I am really appreciate if someone would help me.
Thank You.

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