On time for the exam

exam_h = int(input())
exam_min = int(input())
arrival_h = int(input())
arrival_min = int(input())


exam_time_in_min = exam_h*60 + exam_min

arrival_time_in_min = arrival_h*60 + arrival_min

diff = exam_time_in_min - arrival_time_in_min


if diff < 0:
    print("Late")
    diff = abs(diff)
    if diff>=60:
        hours = diff//60
        minutes = diff % 60
        print('{}:{:02d} hours after the start'.format(hours, minutes))

    else:
        print(f'{diff} minutes after the start')
elif 0<=diff<=30:
    print("On time")
    if diff > 0:
        print(f'{diff} minutes before the start')
elif diff >30:
    print("Early")
    if diff>=60:
        hours = diff//60
        minutes = diff % 60
        print('{}:{:02d} hours before the start'.format(hours, minutes))

    else:
        print(f'{diff} minutes before the start')