input: def check_sum_of_two(x, y, z):
      '''
      Develop a function that receives 3 numeric inputs.
      Returns true if one of these numbers is the sum of the other two, provided all numbers are integers.
      Returns false otherwise.
      
      Examples
      check_sum_of_two(5, 2, 7) ➞ True
      
      check_sum_of_two(3, 2, 2) ➞ False
  
      check_sum_of_two(3, -2, 1) ➞ True
      
      check_sum_of_two(3.6, -2.2, 2) ➞ False
      '''
output:     if not all(isinstance(i, int) for i in [x, y, z]):
          return False
  
      if x + y == z or x + z == y or y + z == x:
          return True
  
      return False