Marta is playing a game where she guesses a five-digit number consisting of different digits. The course of the first three rounds is as follows:

| 1st round | 2 | 6 | 1 | 3 | 8 |
| :--- | :--- | :--- | :--- | :--- | :--- |
| 2nd round | 4 | 1 | 9 | 6 | 2 |
| 3rd round | 8 | 1 | 0 | 2 | 5 |

The color of the cell reveals something about the digit it contains:

- a green cell means the digit is present in the guessed number and is in the correct position,
- a yellow cell means the digit is present in the guessed number but in a different position,
- a gray cell means the digit is not present in the guessed number.

Explain whether Marta can or cannot guess the number with certainty in the next round.

(J. Tkadlec)

Hint. Which digits can appear in the number?
In the guessed number, the digits from the gray fields, i.e., $0,3,5,6,9$, do not appear. There remain exactly five digits - $1,2,4,7,8$ - whose order we will try to determine step by step according to the remaining fields. In each step, we consider all previous conclusions:

- The digit 1 can only be in the second position.
- The digit 2 cannot be in the second, first, fourth, or fifth position; it can only be in the third position.
- The digit 8 cannot be in the second, third, first, or fifth position; it can only be in the fourth position.
- The digit 4 cannot be in the second, third, fourth, or first position; it can only be in the fifth position.
- The digit 7 cannot be in the second, third, fourth, or fifth position; it can only be in the first position.

The only possible number is 71284, which meets all the given requirements. Marta can guess the number with certainty, for example, by the method described above.

Note. Part of the task is also to describe the process leading to the correct answer. A guessed number without proper justification cannot be rated at the highest level.