2.1.6 Sympy

A grade: { 5, 10, 11, 12, 13, 14, 18, 19, 20, 22 }

B grade: { 1, 2, 3, 4, 21, 25, 26, 27, 28 }

C grade: { }

F grade: { 6, 7, 8, 9, 15, 16, 17, 23, 24, 29, 30, 31, 32, 33, 34 }