Several natural numbers were written on the board, and the difference between any two adjacent numbers is the same. Kolya replaced different digits with different letters, and the same digits with the same letters in this sequence. Restore the original numbers if the sequence on the board is Т, ЕЛ, ЕК, ЛА, СС.

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Note that all these numbers can be determined if we know the first number and the difference $d$ between two adjacent numbers. Let's look at the first number. We can only say that it is a single-digit number. As for the difference $d$, looking at the first and second numbers, we can only say that $d<90$. However, since the first and second digits of the second and third numbers coincide, they lie in the same decade, and their difference (equal to $d$) does not exceed 9. Therefore, adding $d$ to the first (single-digit) number, we can only get a two-digit number starting with 1, that is, $\mathrm{E}=1$. Similarly, Л = 2, С $=3$. We get the record: $\mathrm{T}, 12,1 \mathrm{~K}, 2 \mathrm{~A}, 33$. Note that $1 \mathrm{~K}-12=2 \mathrm{~A}-1 \mathrm{~K}=33$ $2 \mathrm{~A}=\mathrm{d}$, from which $33-12=3 \mathrm{~d}, \mathrm{~d}=7$. We have restored the last number and the difference. It is easy to restore the record from here: $5,12,19,26,33$.

## Answer

$5,12,19,26,33$.