Description $($CPP$)$

Please design a class Time represent a specific time point at a day.

Class Time content a default constructor that set time to $00$:$00$:$00$

Class Time content a constructor that take a string$($in hh:mm:ss format$)$ as parameter to construct the object.

Please provide a function toString that return a string representing the time in hh:mm::ss format.

Please overload operator $-$ that operate between two Time object and return the difference in second in int type.

Input

none

Output

none

Sample Input $1$

$00$:$08$:$43$

$18$:$22$:$52$

Sample Output $1$

$00$:$08$:$43$

$18$:$22$:$52$

$65649$