Given a string x, return the sum of all ASCII numbers of all characters.
for example, if x='lala' ('l'-> 108, 'a'->97) then y = 108+97+108+97
Return a list sorted by number of occurrences
MATCH THE STRINGS (2 CHAR) very easy
UICBioE240 problem 1.5
Count the numbers
Add the even numbers
Add the positive numbers
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