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One Line solution in Clear category for Common Words by And
checkio = lambda f, s: ','.join(sorted(set(f.split(',')) & set(s.split(','))))
#These "asserts" using only for self-checking and not necessary for auto-testing
if __name__ == '__main__':
assert checkio("hello,world", "hello,earth") == "hello", "Hello"
assert checkio("one,two,three", "four,five,six") == "", "Too different"
assert checkio("one,two,three", "four,five,one,two,six,three") == "one,three,two", "1 2 3"
Jan. 8, 2016
