class Clock{
int hour;
int min;
int sec;
void toHour(int h){
hour=h;
}
void toMin(int m){
min=m;
}
void toSec(int s){
sec=s;
}
public class A{
public static void main(String arg[]){
Clock clo=new Clock;
clo.hour=20;
clo.min=30;
clo.sec=50;
System.out.printf("%02d:%02d:%02d",hour,min,sec);
}
}