loop adventure game

[ilikedofs]

i am trying to get the loop
to do if user press l go back to previous line
I've looked on the internet and can't find anything that did not pertain to math or advanced projects

if choice=='s':
  print("ok you've choosen  the sword. You see two doors. one is to the left and one is to the right")
  doors=input('Which door do you want to open? l or r ')
 if doors =='r':
     print('you are in an empty room. All there is you and your weapon of choice  ')
 elif doors  =='l':
     print("what are you doing here get out!"",""Some one yells. And punches you and stabs you. You have lost a live")
     lifes=lifes-1
     print('You now have a life total of: ' + int(lifes)

and if I do while True:. it will give me nothing
and now i am getting an error on line 21

Error:
Traceback (most recent call last):
  File "main.py", line 21, in <module>
    print('You now have a life total of: ' + lifes)
TypeError: can only concatenate str (not "int") to str

and here is out put for when i don't have the error and i use while true

Output:
Welcome to the fart monster game
----------------------------------
What is your name d
ok d here are the controls: g(grab),l(left),r(right),u(up),d(down)
press n to start n
----------------------------------------------
You are thrown into a dark room. All you have is a knife and a rope tied around on your wrists and you take the the knife and cut the rope and you find the light switch and turn it on and see a sword and a dagger
Which one do you want? s(sword) or d(dagger) s
ok you've choosen  the sword. You see two doors. one is to the left and one is to the right
Which door do you want to open? l or r l
what are you doing here get out!,Some one yells. And punches you and stabs you. You have lost a live
>