fn main() {
    let mut t = String::new();
    std::io::stdin().read_line(&mut t).ok();
    let t = t.trim().split(":").map(|s| s.parse::<usize>().unwrap()).collect::<Vec<_>>();

    let hour = t[0] + if t[1] + 5 >= 60 { 1 } else { 0 };
    let hour = hour % 24;
    let minutes = (t[1] + 5) % 60;
    println!("{:02}:{:02}", hour, minutes);
}