6 3 12 8 6 1 30 c = 83 lock print b d = 89 print d unlock lock d = 2 print c unlock lock unlock print c end print d print b lock unlock print a b = 62 b = 36 print a print c lock d = 76 unlock print d d = 6 a = 51 lock unlock end print b print d lock d = 79 unlock b = 52 lock a = 62 print a unlock d = 48 print c b = 14 lock print a print b print c print b print a unlock end d = 20 lock print a unlock print b print d lock unlock a = 17 print a lock a = 49 print a d = 12 unlock print d a = 99 lock print b print d print c a = 78 unlock end lock print a print a c = 9 c = 4 a = 30 c = 58 unlock lock unlock print b print c d = 10 lock c = 30 b = 93 print c a = 88 print c print a unlock lock a = 73 unlock print d end c = 63 lock print b c = 67 unlock print d c = 16 lock print b d = 10 unlock lock print a c = 36 d = 70 print b a = 50 unlock print a print a lock unlock print c lock unlock lock unlock lock unlock end