\[ \begin{array} {ccccc} \large & & & \color{red}H & \color{green}A & \color{blue}D\\ \large & & & & \color{red}H & \color{green}A\\ \large + & & & & & \color{red}H \\ \hline \large & & & \color{green}A & \color{red}H & \color{green}A \end{array} \]

**If each letter represents a different nonzero digit, what must \(\color{blue}D\) be?**

This is the hardest

cryptogramwe've challenged you with so far, but they can get much harder yet!

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