Sympy

A grade

{ 15, 16, 17, 18, 19 }

B grade

{ 11 }

C grade

{ }

F normal fail

{ 6, 7, 8, 12, 13, 14 }

F(-1) timedout fail

{ 1, 2, 3, 4, 5, 9, 10 }

F(-2) exception fail

{ }