public static void main(String[] args) {
        
		Scanner scan = new Scanner(System.in);
        String time = scan.next();
        String tArr[] = time.split(":");
        String AmPm = tArr[2].substring(2,4);
        int hh,mm,ss;
        hh = Integer.parseInt(tArr[0]);
        mm = Integer.parseInt(tArr[1]);
        ss = Integer.parseInt(tArr[2].substring(0,2));
        
        String checkPM = "PM",checkAM ="AM";
        int h = hh;
        if(AmPm.equals(checkAM) && hh==12)
        	h=0;
        else if(AmPm.equals(checkPM)&& hh<12)
        	h+=12;
        
        System.out.printf("%02d:%02d:%02d",h,mm,ss);
    }