Why do I have a syntax error using IF, ELIF and ELSE? : <p>This is my code;</p>

<pre><code>    running = True
    while running:
        print("Open Supply Drop?.")
    answer = input()
    if answer == ("Yes"):
       print("Please wait 3 seconds...")
       import time
      time.sleep(3)
      import random
      callingcard =     ['BootsOnTheGround', 'TitanBaseCamp', 'TitanFacility', 'TitanicStorm', 'TitanicCanyon', 'TitanSandstorm', 'ToTheShip', 'AsteroidMines', 'TheSteelDragon', 'C6Assembly', 'C12Patrol']
      print("You got...")
      print(random.choice(callingcard)

    elif answer == ("yes"):
      print("Please wait 3 seconds...")
      import time
      time.sleep(3)
      import random
      callingcard = ['BootsOnTheGround', 'TitanBaseCamp', 'TitanFacility', 'TitanicStorm', 'TitanicCanyon', 'TitanSandstorm', 'ToTheShip', 'AsteroidMines', 'TheSteelDragon', 'C6Assembly', 'C12Patrol']
      print("You got...")
      print(random.choice(callingcard))
    else:
      print("Please wait 3 seconds...")
      import time`enter code here`
      time.sleep(3)
</code></pre>

<p>if, elif and else has a syntax error? I only changed some stuff, and worked perfectly beofr  but now it's staying like this no matter what, is it something to do with the indents?</p>
