fn main() {
    let mut a = String::new();
    std::io::stdin().read_line(&mut a).ok();
    let a: u64 = a.trim().parse().unwrap();

    let h = a / 100;
    let m = 6 * ((a % 100) / 10);

    println!("{:02}:{:02}", 10 + h, m);
}