input: Write a function called print_comparison that takes two parameters, x and y, and prints "x is greater than y" if x is greater than y, otherwise prints "y is greater than or equal to x".
  assert print_comparison(5, 3)=='5 is greater than 3'
  assert print_comparison(3, 5)=='5 is greater than or equal to 3'
  assert print_comparison(7, 7)=='7 is greater than or equal to 7'
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")