Hello adding

Fill letters instead of digits so the indicated sum (equal letters represent equal digits). What number is hidden under the letter J?

A
A H
A H O
A H O J
--------------------------
4 3 2 1

Correct result:

J =  1

Solution:

$$\begin{gathered} A=3 \\ H=8 \\ O=9 \\ J=1 \\ \text{ Verifying Solution: } \\ s=3+38+389+3891=4321 \end{gathered}$$

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