public class Program
{
    public static void Main()
    {
        //int num = int.Parse(Console.ReadLine() ?? string.Empty);
        //string[] str = (Console.ReadLine() ?? string.Empty).Trim().Split(' ');
        string str = Console.ReadLine() ?? string.Empty;

        int h = int.Parse(str.Substring(0, 2));
        int m = int.Parse(str.Substring(str.Length-2,2));

        m += 5;
        if(m >= 60)
        {
            m -= 60;
            h++;
            if(h >= 24)
            {
                Console.WriteLine("00:0{0}",m);
                return;
            }
            
        }
        if(h.ToString().Length == 1)
        {
            Console.Write("0{0}:", h);
        }
        else
        {
            Console.Write("{0}:",h);
        }
        if(m.ToString().Length == 1)
        {
            Console.WriteLine("0{0}",m);
        }
        else
        {
            Console.WriteLine("{0}",m);
        }
    }
}