print$($message$)$

For these inputs, the returned message should start with $"$By$"$ and end with $"$up$.",$ totaling $1,050$ characters.

Key List Format:

Assume the following for the key$\_$list$\_$file:

The file always has only one line of text containing characters separated by I.

$I$ That line always starts with $|,$ so key$\_$list $[0]$ is

If you read the my$\_$keys.txt example file into a list you should get the following list$($length $57)$ :

Indexing:

Notice that in this example, key$\_$list $[1]$ corresponds to $\text{'}$ j $\text{'},$ key$\_$list$[2]$ to $\text{'}$ s$\text{'},$ and so on$.$

Numbers in the image array map to key$\_$list indices.

Important Notes:

Indices Matter: When reading key$\_$list$\_$file ensure elements are correctly indexed, otherwise your deciphering won't work. Use the example I show above to ensure you are getting the same list

Threshold T: Equal to len$($key$\_$list$).$ Only numbers between $1$ and $T-1$ are valid.

Zero and Out$-$of$-$Range Numbers: Ignore zeros and numbers not in the valid range.

Empty Strings: An empty string in key$\_$list means no character is added for that number.