With time you’ll start thinking different (some one already say that 
)
In general term, you use tuple for a structured data that you know the size in compile time. In your case we can’t.
But why knowing the size is so important? It allows you to play easily with the data.
For example pattern matching become an elegant way to accomplish things. With list, you can use [tail | head] for matching data.
E.g:
[h|t] = [1,2,3]
# h -> 1
# y -> [2,3]
Doing this with tuple is little bit harder. The first way is : you now the size you can match data so you can do something like the code bellow
{a,b,c} = {1,2,3}
However, imagine you put 50 elements in the tuple and it become a nightmare.
Or you can use elem/2 But it’s not a pattern matching and it will not be useful in our case.
elem({1,2,3}, 1)
2
I explain you that because the main thing about functional programming is thinking of the future. When you write a function your main goal is to provide a piece of code that could be use again and again without any modification. That’s why I had 3 little functions instead of one bigger. Each one does exactly one thing.
So here, I use a list because needs could evolve to : if there is rights numbers but in different order print « you were close » in the console. Doing this with list a pretty easy and the code will be elegant (It could be an great exercice btw).
And for charlists, you can take a look at https://stackoverflow.com/questions/30037914/elixir-lists-interpreted-as-char-lists
When I was young I was diagnosed with dyslexia. With time, code help me a lot. Keep in mind dyslexia is an advantage. Your brain work differently and it will give you the opportunity to think how to accomplish things differently.
Have a great day 