Digits to words

nums = {
    0: 'Zero',1: 'One', 2: 'Two', 3: 'Three', 4: 'Four',
    5: 'Five', 6: 'Six', 7: 'Seven', 8: 'Eight', 9: 'Nine',
    10: 'Ten', 11: 'Eleven', 12: 'Twelve', 13: 'Thirteen',
}

while True:
    try:
        num = int(input("Enter the number: "), 0)

    except ValueError:
        print("Not an integer.\n")

    else:
        if num in nums:
            print('%d: %s\n' % (num, nums[num]))

        else:
            print("Number not recognized.\n")