hour = 0
while hour < 24:
    minute = 0
    while minute < 60:
        if minute == 30:
            minute += 15
            continue
        print(hour, ":", minute)
        minute += 15
    hour += 1

'''
for hour in range(24):
    for minute in range(0, 60, 15):
        print(hour, ":", minute)
        if minute == 30:
            break
'''
'''
for i in range(10):
    print("Hello World")
'''