input: Write a function to check if an element exists within a given list of integers. Return True if the element exists, otherwise return False.
  
  assert element_exists(3, [1, 2, 3, 4, 5])==True
  assert element_exists("apple", [1, "apple", 3.5, True])==True
  assert element_exists(7, [1, 2, 3, 4, 5])==False
  assert element_exists(True, [1, 2, 3, 4, 5])==False
  assert element_exists(None, [1, 2, 3, None, 5])==True
output: def element_exists(element, lst):
      return element in lst