input: def is_sum_of_two(x, y, z):
      '''
      Define a function that takes in three integers.
      Returns true if one integer equals the sum of the other two, and all inputs must be integers.
      Returns false in any other scenario.
      
      Examples
      is_sum_of_two(5, 2, 7) ➞ True
      
      is_sum_of_two(3, 2, 2) ➞ False
  
      is_sum_of_two(3, -2, 1) ➞ True
      
      is_sum_of_two(3.6, -2.2, 2) ➞ False
      '''
output:     
      if not all(isinstance(i, int) for i in (x, y, z)):
          return False
      return x == y + z or y == x + z or z == x + y
  