Some errors

[Louis-udm]

1.Notebook 07, Question 21:
if s[0] == "UP":
x -= int(s[1]) -> y+=
if s[0] == "DOWN":
x += int(s[1]) -> y-=
if s[0] == "LEFT":
y -= int(s[1]) -> x-=
if s[0] == "RIGHT":
y += int(s[1]) -> x+=

2.Noteboook 17, Question 67, at first solution:
print("Middle value:", x) -> print("Middle index:", x)