package yukicoder;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class N525 {

	public static void main(String[] args)throws IOException
	{
		BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
		String str=br.readLine();
		String[] s=str.split(":");
		Integer[] i=new Integer[2];
		for(int j=0;j<2;j++)
		{
			i[j]=Integer.parseInt(s[j]);
		}
		i[1]+=5;
		if(i[1]>=60)
		{
			i[1]-=60;
			i[0]+=1;
			if(i[0]>=24)
			{
				i[0]-=24;
			}
		}
		String[] ss=new String[2];
		for(int j=0;j<2;j++)
		{
			int e=0;
			e=(i[j]<10)?1:0;
			ss[j]=String.valueOf(i[j]);
			if(e==1){ss[j]="0"+ss[j];}
		}
		System.out.println(ss[0]+":"+ss[1]);


	}

}