#include<iostream>
#include<vector>
#include<string>
#include<algorithm>
#include<bits/stdc++.h>
using namespace std;
#define CLK_TCK 100
int main(void){
int c1, c2;
cin>>c1>>c2;
float sub = (float)(c2 - c1);
float sec = (float)sub/(float)CLK_TCK;
int hour = sec/3600;
float remain = sec - hour * 3600;
int minute = remain/60;
remain = remain - minute * 60;
sec = round(remain);
int second = (int)sec;
printf("%02d:%02d:%02d\n", hour, minute, second);
return 0;
}
https://github.com/ZouJiu1/PAThttps://github.com/ZouJiu1/PAT