print "++ACCCOUNTMAKER++"
 yn=raw_input("Do you have an account?<y,n>")

 Users=['admin','dog']  ##Defualt usernames and passwords
 Password=['admin','cat']
 dog=0
 n=1
 enter=0
 if yn=='n':
     user=raw_input("Enter username:")
     while(user in Users):
     print "Username already taken.\nPlease choose anothername."
     user=raw_input("Enter username:")
     n=1
     if(n!=2):
     passw=raw_input("Enter password:")
     Password.append(passw)
     Users.append(user)
     print "\nAccount made!"
     enter=1
 if(yn=='y' or enter==1 ):
     while dog!=1:
     username=raw_input("Enter username:")
     passw=raw_input("Enter password:")
     if(username in Users and passw in Password):
     if Users.index(username)==Password.index(passw):
     print "\nWelcome!"
     dog=1
     elif(dog!=1):

     print"invalid username or password!Try again."
 else:
     print"error, invalid input"