timeDifference

#include <bits/stdc++.h>
using namespace std;

#define ms(s,n) memset(s,n,sizeof(s))
#define all(a) a.begin(),a.end()
#define present(t, x) (t.find(x) != t.end())
#define sz(a) int((a).size())
#define FOR(i, a, b) for (int i = (a); i < (b); ++i)
#define FORd(i, a, b) for (int i = (a) - 1; i >= (b); --i)
#define pb push_back
#define pf push_front
#define fi first
#define se second
#define mp make_pair
#define endl "\n"
#define set setw(2)<<setfill('0')

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<int,int> pi;
typedef vector<int> vi;
typedef vector<pi> vii;

const int MOD = (int) 1e9+7;
const int INF = (int) 1e9+2804;
inline ll gcd(ll a,ll b){ll r;while(b){r=a%b;a=b;b=r;}return a;}
inline ll lcm(ll a,ll b){return a/gcd(a,b)*b;}

struct time1 {
    int h,t,s;
    // constructor khong co tham so (parameter)
    time1(){
        h=0;
        t=0;
        s=0;
    }
    time1 (int _h, int _t, int _s){
        h=_h;
        t=_t;
        s=_s;
    }

};

void  getDifference(time1 a, time1 b){
    int deltaHour, deltaMin, deltaSec;
    // mac dinh la a.h > b.h
    if(a.s>=b.s){
        deltaSec=a.s-b.s;
    }
    else {
        a.s+=60;
        a.t--;
        deltaSec=a.s-b.s;
    }
    if(a.t>=b.t){
        deltaMin=a.t-b.t;
    }
    else {
        a.t+=60;
        a.h--;
        deltaMin=a.t-b.t;
    }
    if(a.h<=b.h) deltaHour=0;
    else deltaHour=a.h-b.h;
    cout<<set<<deltaHour<<":"<<set<<deltaMin<<":"<<set<<deltaSec;
}

struct Time{
    int hour, minute, second;
    Time(){
        hour=minute=second=0;
    }
    Time(int initHour, int initMinute, int initSecond){
        hour=initHour;
        minute=initMinute;
        second=initSecond;
    }
    void getTimeDifference(Time other){
        int dh,dm,ds;
        if(second>=other.second){
            ds=second-other.second;
        }
        else {
            second+=60;
            minute--;
            ds=second-other.second;
        }
        if(minute>=other.minute){
            dm=minute-other.minute;

        }else{
            minute+=60;
            hour--;
            dm=minute-other.minute;
        }
        if(hour>=other.hour){
            dh=hour-other.hour;
        }
        else dh=0;
        cout<<set<<dh<<":"<<set<<dm<<":"<<set<<ds;
    }
};



int main(){
    Time a,b;
    cin>>a.hour>>a.minute>>a.second;
    cin>>b.hour>>b.minute>>b.second;
    if(a.hour>b.hour){
        a.getTimeDifference(b);
    }
    else {
        b.getTimeDifference(a);
    }
    return 0;
}