To a topologist, a coffee mug and a donut are identical because they both have exactly one hole. Similarly, letters like A, B, C, D, P, and R are all topologically equivalent—they each have a single hole! The frustrated character is typing what looks like gibberish to us, but to a topologist, they're just repeating the same letter over and over in different fonts. Why use different symbols when they're fundamentally the same shape? Mathematical efficiency at its finest!