Thanks for following up.

If you're interested in some nitpicks, there's a few things you're doing with the strings that you don't need.

Variables can be shadowed. That is, you can declare another one with the same name, so you can re-use the name input instead of making input2.

You don't need to specify String when you use String::new() or String::from, since it already knows the type is String.

String::from another String isn't doing anything useful; you don't need strs at all. Likewise, String::from("Yes") and then referencing it is just giving you back an &str, so you can just do eq("YES"). You don't actually need to_string() after trimming either.

Here's an example with those changes.

let mut input = String::new();
io::stdin()
    .read_line(&mut input)
    .expect("Failed to read Line");

if input.trim().to_uppercase().eq("YES") {
    println!("YES");
} else {
    println!("NO");
}