Sympy

A grade

{ 3, 4, 6, 10, 11, 12 }

B grade

{ 1, 5, 22 }

C grade

{ }

F normal fail

{ 2, 9, 13, 14, 15, 16, 17, 18, 19, 20, 21, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35 }

F(-1) timedout fail

{ 7, 8 }

F(-2) exception fail

{ }