Find the difference between two sets, namely ${9.2, -\frac{3}{\sqrt{2}}, -7, 7} \setminus {-7, 0, -1.9, 5}$.

import math

fst = set((9.2, -(3/(math.sqrt(2))), -7, 7,))
snd = set((-7, 0, -1.9, 5,))
print(fst - snd)
