Replacement index 1 out of range for positional args tuple

Question

import math
x = float(input())
y = float(input())
z = float(input())
x2z = math.pow(x, z)
z2 = math.pow(z, z)
y2z = math.pow(y, z)
xy2z = math.pow(x, y2z)
xfabs = math.f