text: strArr=["1, 3, 4, 7, 13", "1, 2, 4, 13, 15"]
  v=set(map(int,strArr[0].split(',')))
  print(v)
  q=set(map(int,strArr[1].split(',')))
  print(q)
  c=sorted(list(v&q))
  print(c)
  if len(c)==0:
      print('false')
  d=""""""
  for i in range(len(c)):
      d+=str(c[i])
      if i<len(c)-1:
          d+=","
  print(d)
  