153. The Merchant's Secret. A merchant, wishing to keep his accounts secret, chose a ten-letter word (all different) like ZACHERKNUTY, where each letter corresponds to a digit in the following order: $1,2,3,4,5,6,7,8,9,0$. For example, in the case of the given keyword, ZA means 12, CHER - 345, and so on. If the sum

$$
\begin{gathered}
\begin{array}{r}
\text { DESKCH } \\
\text { INWOP }
\end{array} \\
\hline \text { PDSIWN }
\end{gathered}
$$

is written in this code, what keyword did the merchant use? It is not difficult to find the answer.
153. The only word (not a meaningless set of letters) that meets the given conditions is LAMP. The sum is deciphered as follows:

\[
\begin{array}{r}
36407 \\
+\quad 98521 \\
\hline 134928
\end{array}
\]