fn main(){
	let input = scan();
	let vec: Vec<&str> = input.split(':').collect();
	let mut hour: i32 = vec[0].parse().unwrap();
	let mut minute: i32 = vec[1].parse().unwrap();
	minute += 5;
	if minute > 59 {
		hour += 1;
		minute -= 60;
	}
	if hour > 23 {
		hour = 0;
	}
	println!("{:02}:{:02}", hour, minute);
}

fn scan() -> String {
	let mut s = String::new();
	std::io::stdin().read_line(&mut s).expect("read_line Error");
	s.trim().to_string()
}