input: from typing import Dict
  
  def print_customer_data(customers: Dict[str, str], name: str) -> None:
      """ Searches for a given customer name in the provided dictionary and prints 
      their details if found.
      >>> print_customer_data({'Alice': '123-456-7890', 'Bob': '987-654-3210'}, 'Alice')
      Alice: 123-456-7890
      >>> print_customer_data({'Alice': '123-456-7890', 'Bob': '987-654-3210'}, 'Charlie')
      Customer not found.
      """
      if name in customers:
          print(f"{name}: {customers[name]}")
      else:
          print("Customer not found.")
output:     if name in customers:
          print(f"{name}: {customers[name]}")
      else:
          print("Customer not found.")