time = input()


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



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


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

    elif hour == '12' or hour == '1' or hour == '2':
        if int(minutes) <= 59:
                 print('beer time')
    else:
        print('invalid time')
else:
    print('invalid time')