#include <bits/stdc++.h>
using namespace std;

#define INF_LL (ll)1e18
#define INF (int)1e9
#define REP(i, n) for(int i = 0;i < (n);i++)
#define FOR(i, a, b) for(int i = (a);i < (b);i++)
#define all(x) x.begin(),x.end()
#define fs first
#define sc second
using ll = long long;
using PII = pair<int, int>;
using PLL = pair<ll, ll>;

const double eps = 1e-10;

template<typename A, typename B>inline void chmin(A &a, B b){if(a > b) a = b;}
template<typename A, typename B>inline void chmax(A &a, B b){if(a < b) a = b;}

int main(void){
	cin.tie(0);
	ios::sync_with_stdio(false);
	int a, b;
	double s;
	char c;
	scanf("%d %d %c%c%c%lf", &a, &b, &c, &c, &c, &s);
	int d = (s-9)*60;
	int now = (a*60+b+d+60*24)%(60*24);

	cout << setfill('0') << setw(2) << now/60 << ":";
	cout << setfill('0') << setw(2) << now%60 << endl;
}