2.1.6 Sympy

A grade: { 1, 2, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 24, 25, 27, 28, 29, 30, 31, 36, 38, 42, 43, 44 }

B grade: { 26, 34, 35 }

C grade: { 12, 23 }

F grade: { 3, 4, 32, 33, 37, 39, 40, 41 }