fn main() {
    let mut tt = String::new();
    std::io::stdin().read_line(&mut tt).ok();
    let tt: Vec<u64> = tt.trim().split(':').flat_map(str::parse).collect();

    let mut m = tt[1] + 5;
    let h = (tt[0] + m / 60) % 24;
    m %= 60;

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