Changing letters

[Lanzaa]

30 min after 7:00am edited 15 times for gramar

I've done it!!!!!

Code:

CLS
INPUT "sentence test"; a$
FOR letter = 1 TO LEN(a$)
b = ASC(MID$(a$, letter, 1))
b = b + 1
b$ = CHR$(b)
MID$(a$, letter, 1) = b$
NEXT letter
PRINT a$

now i just need to stop spaces going! and z's going { or }