#include <bits/stdc++.h>
//#include<boost/multiprecision/cpp_int.hpp>
//#include<boost/multiprecision/cpp_dec_float.hpp>
//#include <atcoder/all>
#define rep(i, a) for (int i = (int)0; i < (int)a; ++i)
#define rrep(i, a) for (int i = (int)a - 1; i >= 0; --i)
#define REP(i, a, b) for (int i = (int)a; i < (int)b; ++i)
#define RREP(i, a, b) for (int i = (int)a - 1; i >= b; --i)
#define repl(i, a) for (ll i = (ll)0; i < (ll)a; ++i)
#define pb push_back
#define eb emplace_back
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define popcount __builtin_popcount
#define fi first
#define se second
using ll = long long;
constexpr ll mod = 1e9 + 7;
constexpr ll mod_998244353 = 998244353;
constexpr ll INF = 1LL << 60;

// #pragma GCC target("avx2")
// #pragma GCC optimize("O3")
// #pragma GCC optimize("unroll-loops")

//using lll=boost::multiprecision::cpp_int;
//using Double=boost::multiprecision::number<boost::multiprecision::cpp_dec_float<1024>>;//仮数部が1024桁
template <class T>
inline bool chmin(T &a, T b)
{
	if (a > b)
	{
		a = b;
		return true;
	}
	return false;
}
template <class T>
inline bool chmax(T &a, T b)
{
	if (a < b)
	{
		a = b;
		return true;
	}
	return false;
}

template <typename T>
T mypow(T x, T n, const T &p = -1)
{ //x^nをmodで割った余り

	if (p != -1)
	{
		x %= p;
	}
	T ret = 1;
	while (n > 0)
	{
		if (n & 1)
		{
			if (p != -1)
				ret = (ret * x) % p;
			else
				ret *= x;
		}
		if (p != -1)
			x = (x * x) % p;
		else
			x *= x;
		n >>= 1;
	}
	return ret;
}

using namespace std;
//using namespace atcoder;

void solve()
{
	int a,b;
	string s;
	cin>>a>>b>>s;
	if(s.size()==5){
		int num=s.back()-'0';
		if(s[s.size()-2]=='+'){
			num-=9;
			a+=num;
		}
		else {
			num+=9;
			a-=num;
		}
	}else if(s.size()==6){
		int num=10+(s.back()-'0');
		if(s[s.size()-3]=='+'){
			num-=9;
			a+=num;
		}
		else {
			num+=9;
			a-=num;
		}
	}else if(s.size()==7){
		int min=6*(s.back()-'0');
		int num=s[s.size()-3]-'0';
		if(s[s.size()-4]=='+'){
			num-=9;
			a+=num;
			b+=min;
		}
		else {
			num+=9;
			a-=num;
			b-=min;
		}
	}else{
		int min=6*(s.back()-'0');
		int num=10+(s[s.size()-3]-'0');
		if(s[s.size()-5]=='+'){
			num-=9;
			a+=num;
			b+=min;
		}
		else {
			num+=9;
			a-=num;
			b-=min;
		}
	}
	if(b<0){
		a--;
		b=(b+60)%60;
	}else if(b>=60){
		a++;
		b%=60;
	}

	a=(a+24)%24;
	if(a<10){
		cout<<"0"<<a;
	}else{
		cout<<a;
	}
	cout<<":";
	if(b<10){
		cout<<"0"<<b;
	}else{
		cout<<b;
	}
	cout<<"\n";
}

int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	cout << fixed << setprecision(15);
	solve();
	return 0;
}