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easy solution in Clear category for Common Words by thorgrimm
def checkio(first, second):
liste1 = set(first.split(","))
liste2 = set(second.split(","))
s = (liste1 & liste2)
s = sorted(s)
print (','.join(s))
return (','.join(s))
#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"
Feb. 17, 2016
