##### OUTPUT
1
  Enter comma seperated integers
  1,2,3,4,6,7,8
  Enter pair sum
  10
  [[2, 8], [3, 7], [4, 6]]


2
  Enter comma seperated integers
  1,2,3,4,6,7,8
  Enter pair sum
  5
  [[1, 4], [2, 3]]

3
  Enter comma seperated integers
  1,2,3,4,6,7,8
  Enter pair sum
  20
  []

4
  Enter comma seperated integers
  1,2,3,4,6,7,a
  Invalid Input (Only Integers allowed)