How to send user back to the beginning of a block of code

Question

So im building a simple password checker in Python. In the code below, after returning the statment "Incorrect, try again." I want to the program to go back to the if statement so the user can retry entering their password.

   #An extremly simply password checker.

#Retrieving desired password
upw = input("What would you like your password to be?: ")

#Checking Password
ask = input("Enter your password: ")

if str(ask) == str(upw):
   print("Accsess Granted")
else:
   print("Incorrect, try again.")