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First solution in Clear category for Common Words by wrak
def checkio(first, second):
f = first
s = second
f=f.split(',')
s=s.split(',')
l=list(set(f) & set(s))
l=sorted(l)
return ','.join(l)
#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"
Oct. 27, 2017
