using substitution variable problem in oracle

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SQL

Oracle

DECLARE
localvar char;
BEGIN
localvar := &ENUMBER;
IF localvar ='A' then
dbms_output.put_line('Please proceed to Level1');
ELSIF localvar='B' or localvar='C' then
dbms_output.put_line('Please proceed to Level2');
ELSIF localvar='D' then
dbms_output.put_line('Please proceed to Level3');
ELSE
dbms_output.put_line('Invalid Entry');
END IF;
END;


i want to prompt the user for input using substitution variable but its not working for me any help would be appreciated