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

#define INF 1.1e9
#define LINF 1.1e18
#define FOR(i,a,b) for (int i=(a);i<(b);++i)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) (v).begin(),(v).end()
#define pb push_back
#define pf push_front
#define fi first
#define se second
#define BIT(x,n) bitset<n>(x)
#define PI 3.14159265358979323846

typedef long long ll;
typedef pair<ll,int> P;
typedef pair<ll,P> PP;

//-----------------------------------------------------------------------------

int a,b;
string s;
int sign;
double dif;

int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);

	cin>>a>>b>>s;
	int now=a*60+b;
	now-=9*60;
	sign=(s[3]=='+'?1:-1);
	string t;
	FOR(i,4,(int)s.size()) t+=s[i];
	dif=stof(t)*10*6;
	//printf("%f\n",dif);
	if(sign==-1) now-=dif;
	else now+=dif;
	(now+=24*60)%=(24*60);
	printf("%02d:%02d\n",now/60,now%60);

	return 0;
}