Task 1. In a numerical expression, some digits were replaced with letters (different digits with different letters, the same digits with the same letters). The result is as follows:

$$
2018 A: B C D=A A \text {. }
$$

What numerical expression was originally written? (It is sufficient to provide an example. $2018 A$ was originally a five-digit number.)
Answer: $20185: 367=55$.

Remark. No other examples exist.

## Criteria

## 4 p. A correct example is provided.