#include <iostream>
#include <iomanip>
#include <string>

void solve() {
    int a, b;
    std::string s;
    std::cin >> a >> b >> s;

    a -= 9;

    int sign = (s[3] == '+' ? 1 : -1);
    s = s.substr(4);

    int h = 0;
    while (!s.empty() && std::isdigit(s.front())) {
        h = h * 10 + s.front() - '0';
        s.erase(s.begin());
    }

    int m = 0;
    if (!s.empty()) {
        m = (s.back() - '0') * 6;
    }

    a += h * sign, b += m * sign;

    while (b < 0) {
        b += 60;
        --a;
    }
    while (b >= 60) {
        b -= 60;
        ++a;
    }

    while (a < 0) a += 24;
    while (a >= 24) a -= 24;

    std::cout << std::setw(2) << std::setfill('0') << a << ":"
              << std::setw(2) << std::setfill('0') << b << std::endl;
}

int main() {
    std::cin.tie(nullptr);
    std::ios::sync_with_stdio(false);

    solve();

    return 0;
}