INPUT a$
FOR i=1 TO LEN(a$)
b$=MID$(a$,i,1)
IF ASC(b$)>=65 AND ASC(b$)<=90 OR ASC(b$)>=97 AND ASC(b$)<=122 THEN c$=c$+"*" ELSE c$=c$+b$
NEXT
PRINT c$
INPUT a$
FOR i=1 TO LEN(a$)
b$=MID$(a$,i,1)
IF ASC(b$)>=65 AND ASC(b$)<=90 OR ASC(b$)>=97 AND ASC(b$)<=122 THEN c$=c$+"*" ELSE c$=c$+b$
NEXT
PRINT c$