input: 
  def find_customer(name: str) -> str:
      """
      Given a customer name, searches the database for the customer's data and returns it as a string.
      
      >>> find_customer("John Doe")
      "Name: John Doe, Address: 123 Main St, Phone: 555-1234"
      >>> find_customer("Jane Smith")
      "Name: Jane Smith, Address: 456 Elm St, Phone: 555-5678"
      """
      # Implementation code to search and return customer data by name
      pass
  
  # Main function for the customer search application
  if __name__ == "__main__":
      import sys
      
      # Get command line arguments
      args = sys.argv
      
      if len(args) == 2:
          name = args[1]
          print(find_customer(name))
      else:
          print("Invalid arguments, please specify a customer name.")
  
output:     customers = {
          "John Doe": "Name: John Doe, Address: 123 Main St, Phone: 555-1234",
          "Jane Smith": "Name: Jane Smith, Address: 456 Elm St, Phone: 555-5678"
      }
      
      if name in customers:
          return customers[name]
      else:
          return "Customer not found"