input: Write a function to determine whether a given number is even or odd. The function should return "Even" if the number is even, and "Odd" if the number is odd.
  assert even_or_odd(4)== "Even"
  assert even_or_odd(3)== "Odd"
  assert even_or_odd(0)== "Even"
  assert even_or_odd(-1)== "Odd"
  assert even_or_odd(-2)== "Even"
output: def even_or_odd(n):
      return "Even" if n % 2 == 0 else "Odd"