Encode and Decode Strings

You are given a list of strings. Your task is to implement two operations:

• Encode: Convert a list of strings into a single string.
• Decode: Convert the encoded string back into the list of original strings.

The encoding rule is as follows: for each string, first append the length of the string (in decimal), then a colon, and then the string itself. The encoded result is the concatenation of all such encoded strings.

For example, if the input list is \( [\texttt{hello},\texttt{world}] \), the encoded string should be:

\[ 5:hello5:world \]

You need to support both encoding and decoding. The input will start with a mode indicator (encode or decode). When the mode is encode, you will be given an integer \( n \) followed by \( n \) strings, and you should output the encoded string. When the mode is decode, you will be given an encoded string, and you should output the decoded strings each on a separate line.

Note: Strings may contain spaces and special characters. An empty string will be represented as a blank line.

inputFormat

The first line of input contains a command: either encode or decode.

• If the command is encode:
• The second line contains an integer \( n \), the number of strings.
• The next \( n \) lines each contain a string. These strings can be empty or contain spaces.
• If the command is decode:
• The second line contains the encoded string.

outputFormat

If the command is encode, output a single line containing the encoded string.

If the command is decode, output the decoded strings, one per line. If there are no decoded strings, output nothing.

## sample

encode
2
hello
world

5:hello5:world