Merkkijono

error[E0463]: can't find crate for `text_io`
 --> input/code.rs:3:1
  |
3 | extern crate text_io;
  | ^^^^^^^^^^^^^^^^^^^^^ can't find crate

error: aborting due to previous error

For more information about this error, try `rustc --explain E0463`.

#![allow(non_snake_case)]
#[macro_use]
extern crate text_io;

fn main() {
    let l: u8 = read!();
    let mut ans: Vec<char> = vec![];

    for c in 0..l {
        for _ in 0..ans.len() {
            ans.push((65 + c) as char);
            ans.rotate_left(1);
        }
        ans.push((65 + c) as char);
    }
    let realans: String = ans.into_iter().collect();
    println!("{}", realans.to_ascii_lowercase());
}