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First solution in Clear category for Common Words by klaganowski
def checkio(first, second):
s_1 = set(first.split(","))
s_2 = set(second.split(","))
return ",".join(sorted(s_1.intersection(s_2)))
#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"
Dec. 5, 2016