import java.io.InputStream;
import java.io.PrintWriter;
import java.lang.reflect.Array;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.PriorityQueue;
import java.util.Scanner;
import java.util.Set;
import java.util.Stack;
import java.util.TreeMap;
import java.util.TreeSet;

import static java.util.Comparator.*;

public class Main {
    public static void main(String[] args) {
        PrintWriter out = new PrintWriter(System.out);
        Solver solver = new Solver(System.in, out);
        solver.solve();
        out.close();
    }
}
class Solver {
	Scanner sc;
	PrintWriter out;
    public Solver(InputStream in, PrintWriter out) {
    	sc = new Scanner(in);
    	this.out = out;
    }
    // ==================================================================
    public void solve() {
    	int A = Integer.parseInt(sc.next());
    	int B = Integer.parseInt(sc.next());
    	char[] C = sc.next().toCharArray();
    	String t = "";
    	for (int i = 4; i < C.length; i++) {
			t += C[i];
		}
    	BigDecimal dw = new BigDecimal(t);;
//    	out.println(" " + C[3] + "  dw = " + dw);
    	if(C[3] == '+')	{
    		dw = dw.subtract(new BigDecimal(9));
    	} else {
    		dw = BigDecimal.ZERO.subtract(dw).subtract(new BigDecimal(9));
    	}
    	boolean f = true;
    	if(dw.compareTo(BigDecimal.ZERO) < 0)	 {
    		f = false;
    		dw = BigDecimal.ZERO.subtract(dw);
    	}
    	int j = dw.intValue();
    	int m = dw.multiply(BigDecimal.TEN).intValue() - j * 10;
//    	out.println(" dw = " + dw + "   j = " + j + "  m = " + m);
    	m *= 6;		// m / 10 * 60
//    	out.println("   -->   m = " + m);
    	if(f) {
    		for (int i = 0; i < j; i++) A++;
    		B += m;
    		if(B >= 60) {	B -= 60;	A++;}
			if(A >= 24)	A -= 24;
    	} else {
    		for (int i = 0; i < j; i++) A--;
    		B -= m;
    		if(B < 0) {	B += 60;	A--;}
			if(A < 0)	A += 24;
    	}
    	out.println(String.format("%02d", A) + ":" + String.format("%02d", B));
    }
}