Как Зациклить attack input в "ролевухе" на Python 3

[Lektorfuja]

import random
playerlevel=0
playerhp=10
monsterhp=5
playerhit=random.randint(2,3)
monsterhit=random.randint(1,2)
playerafter=playerhp-monsterhit
menu=input("castle/forest")
def castle():
       monsterafter=monsterhp-playerhit
       a=input("attack monster? yes/no")
       if a=="yes":
       while monsterafter=='1':
                 monsterafter=monsterafter-1
       if monsterafter=='0': print ("you won")
       print("player",playerafter, "monster", monsterafter)
if menu=="castle":castle()

Осталось зациклить attack input и поставить счётчик while на playerlevel.но как?

[BDA]

import random

playerlevel = 0
playerhp = 10

def castle():
    global playerhp
    monsterhp = 5
    while playerhp > 0 and monsterhp > 0:
        print("Player HP: %d Monster HP: %d" % (playerhp, monsterhp))
        a = input("Attack monster? (yes/no):")
        if a == "no":
            print("Escape")
            return 0
        playerhit = random.randint(2, 3)
        monsterhit = random.randint(1, 2)
        playerhp -= monsterhit
        monsterhp -= playerhit
    if playerhp > 0:
        print("Player won")
        return 1
    if monsterhp > 0:
        print("Player died")
        return -1

while True:
    print("Player LVL: %d Player HP: %d" % (playerlevel, playerhp))
    menu = input("castle/forest/exit:")
    if menu == "castle":
        playerlevel += castle()
        playerhp = 10
    elif menu == "exit":
        break

print("GAME RESULTS: Player LVL: %d" % (playerlevel))