Example 1 Haha
Zhang classmate laughed "haha" twice and quickly covered her mouth to hold back her laughter. Li classmate teased her, "Ha ya, ha!" Zhang classmate couldn't help it and finally burst into laughter, "hahahaha" continuously. Using this plot, form a multiplication problem:
```
哈哈
x 哈呀哈
```
In the above problem, each Chinese character represents a digit, the same character represents the same digit, and different characters represent different digits. Solve this problem.
Explanation: Each digit of the four-digit product is "Ha"
(We can start from here). Thus, we have
HaHaHaHa $=$ Ha $\times 1111$
$$
\begin{array}{l}
=\text { Ha } \times 11 \times 101 \\
=\text { HaHa } \times 101 .
\end{array}
$$

By comparing with the original equation, we know that “HaYaHa” $=101$, which means “Ha” $=1$, “Ya” $=0$. Therefore, the required equation is
$$
11 \times 101=1111 \text {. }
$$

Verification confirms that the result is correct.