import java.util.Scanner;
public class Main{
	private static Scanner sc=new Scanner(System.in);
	public static void main(String args[])throws Exception{
		String time[]=sc.nextLine().split(":");
		int h=Integer.parseInt(time[0]);
		int m=Integer.parseInt(time[1]);
		m+=5;
		if(m>=60){
			m-=60;
			h++;
			if(h==24){
				h-=24;
			}
		}
		time[0]=String.valueOf(h);
		time[1]=String.valueOf(m);
		for(int i=0;i<time.length;i++){
			if(time[i].length()==1)time[i]=0+time[i];
		}System.out.println(time[0]+":"+time[1]);
	}
}