#define _USE_MATH_DEFINES
#pragma region include
#include <iostream>
#include <iomanip>
#include <stdio.h>

#include <sstream>
#include <algorithm>
#include <iterator>
#include <cmath>
#include <complex>

#include <string>
#include <cstring>
#include <vector>
#include <bitset>

#include <queue>
#include <set>
#include <map>
#include <stack>
#include <list>

#include <ctime>
#pragma endregion //#include
/////////

#pragma region typedef
typedef long long LL;
typedef long double LD;
typedef unsigned long long ULL;
#pragma endregion //typedef
////定数
const int INF = (int)1e9;
const LL MOD = (LL)1e9+7;
const LL LINF = (LL)4e18+20;
const LD PI = acos(-1.0);
const double EPS = 1e-9;
/////////
using namespace::std;

void out(int h,int m){
	if( h<10 ){
		cout<<"0"<<h;
	}else{
		cout << h;
	}
	cout << ":";
	if( m<10 ){
		cout << "0"<<m;
	}else{
		cout <<m;
	}
	cout << endl;
	return;
}
void solve(){
	int a,b;
	string str;
	cin>>a>>b>>str;
	int A=0,B=0;
	vector<int> sp(2,0);
	int pos = 0;
	int size = str.size();
	for(int i=4;i<size;++i){
		if( str[i] == '.' ){
			++pos;
		}else{
			sp[pos] = sp[pos]*10 + str[i]-'0';
		}
	}
	A = sp[0];
	B = sp[1]*6;
	if( str[3] == '-' ){
		A=-A;
		B=-B;
	}
	a= a-9+A;
	b= b+B;
	if( b<0 ){
		a--;
		b += 60;
	}
	a = ((a%24)+24)%24;
	out(a,b);
}
#pragma region main
signed main(void){
	std::cin.tie(0);
	std::ios::sync_with_stdio(false);
	std::cout << std::fixed;//小数を10進数表示
	cout << setprecision(16);//小数点以下の桁数を指定//coutとcerrで別	

	solve();
}
#pragma endregion //main()