import time

def frontEnd():
    enter = (raw_input("Example: '22:00'\nInput current time: ")).split(':')
    enter[0], enter[1] = int(enter[0]), int(enter[1])
    sleepTime(current = enter)

def sleepTime(current = list(time.localtime()[3:5])):
    end = current[0] + 21
    if end >= 24: end -= 24
    
    while current[0] != end:
        out = str(current[0]) + ':' + str(current[1]) 
        if current[0] <= 9: out = '0' + out
        if current[1] <= 9: out = out[0:3] + '0' + out[3:]
        print out
        
        current[1] += 90
        while current[1] >= 60:
            current[0] += 1
            current[1] -= 60
        if current[0] >= 24:
            current[0] -= 24




sleepTime()
print '\n\n\n\n'
frontEnd()



while raw_input('\n\n\n\n\n\nPress enter to quit...'):
    break































##print 'These calculations use the formula (hours awake / 2) - hours sleep = sleep debt'
##print 'It assumes a sleep debt of 0 on the first day.'
##
##print '2006-08-13 12:00-00:00 Awake'
##print '2006-08-14 00:00-03:00'
##print '2006-08-14 03:00-00:00 Awake'
##print '2006-08-15 00:00-06:00'
##print '2006-08-15 06:00-23:00 Awake'
##print '2006-08-16 23:00-03:30'
##
##print '\nFor this information, you would enter in 12, then 3, then 21, then 6, then 17, then 4.5'
##print 'That would be 12+21+17=50 for awake, and 3+6+4.5=13.5'
##print '50/2 = 25, 25-13.5 = 11.5'
##print 'The slept debt is 11 and a half hours.'

#enter data, to add the hours of awake time

##print '   1   2   3   4   5   6   7   8   9   10   11   12   13   14   15   16   17   18   19   20   21   22   23   24'
##print ' /   /   /   /   /   /   /   /   /   /    /    /    /    /    /    /    /    /    /    /    /    /    /    /'
##
#####get current_time
#####get awake_time
#####get wake_time
####
####current_time = 15#'20:42' # raw_input("Enter the current time (00:00): ")
####awake_time = 15#'19:00' # raw_input("Enter how long you've been awake (00:00): ")
####wake_time = 06#'06:00' # raw_input("Enter the time to wake (00:00): ")
####
####if wake_time - 8 < 0:
####    wake_time = wake_time + 16 
####    sleep_time = wake_time - overtime
####overtime = 0
####if awake_time > 16:
####    overtime = (awake_time - 16) / 2.0
####
####print 'Go to sleep at:', sleep_time
####
######
######if int(awake_time[:1]) > 16:
######    overtime = (awake_time[:1] - 16) / 2
######if wake_time[:1] - 8 < 0:
######    wake_time = wake_time[:1] 
######    sleep_time = wake_time - 8 - overtime
######
######print sleep_time