Python Taskbook Level 3.6
Given a list of numbers, remove from it numbers that consist of more than three digits.
Given a string, check that this string consists only of numbers.
Given a number, for example, like this:
num = 12345;
Check that all digits of this number are greater than zero.
Two lists are given:
lst1 = [1, 2, 3, 4, 5]
lst2 = [1, 2, 3]
Check that all the elements of the first list are in the second.
