10 KEY 15,CHR$(&H4)+CHR$(&H46)
20 KEY(15) ON
30 ON KEY(15) GOSUB 210
40 KEY 16,CHR$(&H4)+CHR$(&H2E)
50 KEY(16) ON
60 ON KEY(16) GOSUB 210
70 SCREEN 0,0,0
80 CLS
90 KEY OFF
100 COLOR 10:LOCATE 3,30:PRINT "Security System"
110 COLOR 14:LOCATE 5,10 :PRINT "T E C H N I C A L   S E R V I C E S   D E P A R T M E N T"
120 A=INT(10*RND):B=INT(10*RND):C=INT(10*RND)
130 COLOR 10:LOCATE 10,20:PRINT "The Clues are : A = ";A
140 LOCATE 11,20:PRINT "                B = ";B
150 LOCATE 12,20:PRINT "                C = ";C
160 DUMMY = A^2+B^2-C
170 LOCATE 15,20:INPUT "Enter your password :";PASS
180 IF PASS=DUMMY THEN END
190 GOTO 70
200 'Success
210 'PRINT "da dcsfdef"
220 'IF INKEY$="" THEN 220
230 RETURN 100