input: Write a function that takes two parameters, 'x' and 'y', and prints "x is greater than y" when x is greater than y, otherwise prints "y is greater than or equal to x".
  assert print_comparison(5, 3)==None
  assert print_comparison(3, 5)==None
  assert print_comparison(5, 5)==None
output: def print_comparison(x, y):
      if x > y:
          print("x is greater than y")
      else:
          print("y is greater than or equal to x")