input: from typing import Tuple
  
  def play_game(player1: str, player2: str) -> str:
      """ Implements a decision-making algorithm for a rock-paper-scissors game.
      Returns the result of the game between two players based on their choices.
      >>> play_game('rock', 'scissors')
      'Player 1 wins!'
      >>> play_game('paper', 'paper')
      'It is a draw!'
      >>> play_game('scissors', 'rock')
      'Player 2 wins!'
      """
output:     if player1 == player2:
          return 'It is a draw!'
      elif (player1 == 'rock' and player2 == 'scissors') or \
           (player1 == 'scissors' and player2 == 'paper') or \
           (player1 == 'paper' and player2 == 'rock'):
          return 'Player 1 wins!'
      else:
          return 'Player 2 wins!'