[Python] Manim Community: Color in Equation by Text

I have following Python code to display a matrix in Manim Community:

from manim import *

class Example(Scene):
def construct(self):
A = MathTex(
r"A="
r"\begin{pmatrix}"
r"a_{11} & a_{12} & \dots & a_{1n}\\"
r"a_{21} & a_{22} & \dots & a_{2n}\\"
r"\vdots & \vdots & \ddots & \vdots\\"
r"a_{n1} & a_{n2} & \dots & a_{nn}"
r"\end{pmatrix}"
).center()

self.play(Write(A))



I'd like to give every "a" the same color (like red for example).

I know I can display the indices, and then color each "a" individually by index, but this gets increasingly tideous for bigger equations.

Is there a way to do such things smarter, like a color in by text, or by iterating over the equation?

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