input: Write a function to calculate the square root of a user-defined positive number. If the input number is negative, return the message "Invalid input". Use the math module for the square root calculation.
  assert calculate_square_root(100) == 10.0
  assert calculate_square_root(9) == 3.0
  assert calculate_square_root(0) == 0.0
  assert calculate_square_root(-1) == "Invalid input"
output: def calculate_square_root(number):
      if number < 0:
          return "Invalid input"
      return math.sqrt(number)