Contest1258/C.cpp

#include <iostream>

using namespace std;

int main(int argc, char const *argv[]) {
    int ah, am, as, bh, bm, bs, ch, cm, cs, sc;
    for (; cin >> ah >> am >> as >> bh >> bm >> bs;) {
        sc = 0;
        cs = as + bs + sc;
        sc = cs / 60;
        cs %= 60;
        cm = am + bm + sc;
        sc = cm / 60;
        cm %= 60;
        ch = (ah + bh + sc) % 24;
        cout << ch / 10 << ch % 10 << ":" << cm / 10 << cm % 10 << ":" << cs / 10
             << cs % 10 << endl;
    }
    return 0;
}