using System;
class MainClass {
public static string StringChallenge(string str) {
// code goes here
string [] times = str.Split('-');
string startTime = times[0];
string endTime = times[1];
int startMinutes = TimeToMinutes(startTime);
int endMinutes = TimeToMinutes(endTime);
int difference = endMinutes - startMinutes;
if (difference < 0)
{
difference += 1440;
}
return difference.ToString();
//return str;
} public static int TimeToMinutes(string time){ string[] parts = time.Split(':'); int hour = int.Parse(parts[0]); int minutes = int.Parse(parts[1].Substring(0, 2)); string ampm = parts[1].Substring(2);
if (ampm == "pm" && hour != 12){
hour += 12;
}
else if (ampm == "am" && hour == 12){
hour = 0;
}
return hour*60 + minutes;
}
static void Main() {
// keep this function call here
Console.WriteLine(StringChallenge(Console.ReadLine()));
}
}