Python Taskbook Level 2.10
Given a string of letters and numbers, check that there are no more than three letters in this string.
Given a number, get the first even digit from the end of this number.
Given a string:
'abcde abcde abcde'
Replace the first character of each word in it with '!':
'!bcde !bcde !bcde'
Given a list of strings containing integers:
['1', '2', '3', '4', '5']
Find the sum of the elements of this list.
