10 REM  PROBLEM #23-4 :
20 REM    TYPING TUTOR
30 REM  SOLUTION BY GARY HUDACH
40 REM
50 S$="THE OLD GREY FOX IS SLY AND QUICK":TI$="000000":PRINTS$:FORX=1TOLEN(S$)
60 GETC$:IFC$=""THEN60
70 IF C$<>MID$(S$,X,1)THENM=M+1
80 PRINTCHR$(18);CHR$(145)SPC(X-1)C$:PRINTCHR$(145):NEXT:PRINTM;TI