Attach the length of each string followed by a delimiter (e.g., #) and then the string itself. This ensures the encoded string can be accurately decoded. Store the lengths of all strings, separated by ...

Note that the grouping (1 11 06) is invalid because "06" cannot be mapped into 'F' since "6" is different from "06". Given a string s containing only digits, return the number of ways to decode it.

Design an algorithm to encode a list of strings to a single string. The encoded string is then decoded back to the original list of strings.