import java.util.*;

public class Main{

  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int h = a /100;
    int m = a % 100 * 6 /10;
    if(m<10){
      System.out.println(h+10 +":0"+m);
    }else{
      System.out.println(h+10+":"+m);
    }
  }
}