# Test case #9: beer time
time = input()

hour = time[-8:-6]
minutes = time[-5:-3]
time_designator = time[-2:]


if hour.isdigit() and minutes.isdigit() and time_designator == 'PM':
    if 1 <= int(hour) < 12:
        print('beer time')
    elif int(hour) == 12:
        print('non-beer time')
    else:
        print('invalid time')


elif hour.isdigit() and minutes.isdigit() and time_designator == 'AM':
    if int(hour) == 12 or int(hour) == 1 or int(hour) == 2:
        if int(minutes) <= 59:
            print('beer time')
    elif int(hour) >= 3:
        print('non-beer time')

    else:
        print('invalid time')
else:
    print('invalid time')