player_names = []

active = True

while active:
    prompt = input("Would you like to add players to the list?  ")
    if prompt.lower() == "y":
        prompt_name = input("OK. Please enter a name:  ")
        player_names.append(prompt_name)
    else:
        print("Roster:")
        for number, player in enumerate(player_names, 1):
            print("\t" + str(number), player.title())
        print("There are", len(player_names), "players on the team.")
        active = False

keeper = int(input("Who is the goalkeeper?  "))
print(player_names[keeper - 1].title(), "is the keeper.")