ChasMicolai

#include<iostream>

int main()
{
    int h1,m1,s1,h2,m2,s2;
    char none;
    std::cin>>h1>>none>>m1>>none>>s1;
    std::cin>>h2>>none>>m2>>none>>s2;
    h1=abs(h1);
    h2=abs(h2);
    m1=abs(m1);
    m2=abs(m2);
    s1=abs(s1);
    s2=abs(s2);
    int secondsOne=h1*60*60+m1*60+s1;
    int secondsTwo=h2*60*60+m2*60+s2;
    if(secondsOne>secondsTwo){std::swap(secondsOne,secondsTwo);}
    secondsTwo-=secondsOne;
    int minutesTotal=secondsTwo/60;
    secondsTwo%=60;
    int hoursTotal=minutesTotal/60;
    minutesTotal%=60;
    if (hoursTotal<10) {
        std::cout<<"0"<<hoursTotal<<":";
    }
    else{std::cout<<hoursTotal<<":";}
    if(minutesTotal<10){std::cout<<"0"<<minutesTotal<<":";}
    else{std::cout<<minutesTotal<<":";}
    if(secondsTwo<10){std::cout<<"0"<<secondsTwo;}
    else{std::cout<<secondsTwo;}
}