# include<iostream>
using namespace std;
struct Clock{
int H,M,S;
};
Clock MyClock;
void SetTime(int H,int M,int S)
{
MyClock.H=(H>=0&&H<24)?H:0;
MyClock.M=(M>=0&&M<60)?M:0;
MyClock.S=(S>=0&&S<60)?S:0;
}
void ShowTime()
{
cout<<MyClock.H<<":";
cout<<MyClock.M<<":";
cout<<MyClock.S<<endl;
}
int main()
{ShowTime();
SetTime(8,30,30);
ShowTime();
return 0;
}