fxcw.rs

use std::io::{stdin, BufRead, BufReader};

const CROW: &str = r#"
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                                                      "#;

fn main() -> Result<(), std::io::Error> {
    let mut crow_lines = CROW.lines().skip(1);
    let mut last_crow_line = "";

    for line in BufReader::new(stdin()).lines() {
        let crow_line = match crow_lines.next() {
            Some(crow_line) => {
                last_crow_line = crow_line;
                crow_line
            }
            None => last_crow_line,
        };

        println!("{} {}", crow_line, line?);
    }

    for crow_line in crow_lines {
        println!("{}", crow_line);
    }

    Ok(())
}