#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;
#define FOR(i,m,n) for(int i=(m);i<(n);++i)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) (v).begin(),(v).end()
using ll = long long;
const int INF = 0x3f3f3f3f;
const ll LINF = 0x3f3f3f3f3f3f3f3fLL;
const double EPS = 1e-8;
const int MOD = 1000000007;
// const int MOD = 998244353;
const int dy[] = {1, 0, -1, 0}, dx[] = {0, -1, 0, 1};
const int dy8[] = {1, 1, 0, -1, -1, -1, 0, 1}, dx8[] = {0, -1, -1, -1, 0, 1, 1, 1};
template <typename T, typename U> inline bool chmax(T &a, U b) { return a < b ? (a = b, true) : false; }
template <typename T, typename U> inline bool chmin(T &a, U b) { return a > b ? (a = b, true) : false; }
struct IOSetup {
  IOSetup() {
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);
    cout << fixed << setprecision(20);
  }
} iosetup;

int main() {
  int a, b; string s; cin >> a >> b >> s;
  a -= 9;
  if (s[3] == '+') {
    a += (s.length() == 5 || s[5] == '.' ? s[4] - '0' : stoi(s.substr(4, 2)));
    if (s[s.length() - 2] == '.') {
      b += (s.back() - '0') * 6;
      if (b >= 60) {
        ++a;
        b -= 60;
      }
    }
  } else if (s[3] == '-') {
    a -= (s.length() == 5 || s[5] == '.' ? s[4] - '0' : stoi(s.substr(4, 2)));
    if (s[s.length() - 2] == '.') {
      b -= (s.back() - '0') * 6;
      if (b < 0) {
        --a;
        b += 60;
      }
    }
  }
  ((a %= 24) += 24) %= 24;
  cout << setw(2) << setfill('0') << a << ':' << setw(2) << setfill('0') << b << '\n';
  return 0;
}