month_names = ["January", "February", "March",
               "April", "May", "June", "July",
               "August", "September", "October",
               "November", "December"]

month_lengths = [31, 28, 31, 30, 31, 30,
                 31, 31, 30, 31, 30, 31]

for i in range(0, 12):
    print("{:>13s}: {:>2} days".format(month_names[i], month_lengths[i]))