how do I merge an array of images into a single giant image?

I have 220 png images of equal height and width with the following naming convention:

A1.png, A2.png, ... V9.png, V10.png

I need to merge them into one giant image, with A1 being the top left corner, letters increasing horizontally and numbers increasing vertically. Is there a way to do this that does not involve tediously putting it together piece by piece?

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