#include <iostream>

using namespace std;

int main()
{
    int h1,m1,s1,h2,m2,s2,h,m,s,x=1;  //Problema calculeaza suma a 2 intervale de timp
    cout<<"h1=";
    cin>>h1;
    cout<<"m1=";
    cin>>m1;
    cout<<"s1=";
    cin>>s1;
    cout<<"h2=";
    cin>>h2;
    cout<<"m2=";
    cin>>m2;
    cout<<"s2=";
    cin>>s2;
    h=h1+h2;
    m=m1+m2;
    s=s1+s2;
    if(s>=60){
        x=s/60;
        s=s%60;
        m=m+x;
    }
    if(m>=60){
        x=m/60;
        m=m%60;
        h=h+x;
    }
    cout<<h<<":"<<m<<":"<<s;

    return 0;
}