Shhh. They are listening! We need a plan…

I know, let us use a cipher to hide our conversations. That way they will not understand what we say.

The cipher works like this. You take a sentence and split it into two lists. One has the even words, the other the odd words. All punctuation is ignored.

So for example


"Hello world! I am pleased to meet you!"

odd = [“Hello”, “I” ,”pleased” ,”meet”]
even = [“world”, “am”, “to”, “you”]

You then combine the two lists using these rules –

• Take the last word of each list.
• Take the last letter of each word and place them next to each other. One from each word (starting with odd)
• Repeat until one word is out of letters.
• Place a “!” symbol if it belonged to the odd word or a “#” if it belonged to the even and then copy the rest of the letters.
• Place a space in the output
• Repeat until one list is empty
• Finally copy the last word (if any) over to the output.

So the result of these rules would be –


"Hello world! I am pleased to meet you!"

odd = [“Hello”, “I” ,”pleased” ,”meet”]
even = [“world”, “am”, “to”, “you”]
output = “tueoey!m doet!saelp im#a odlllreohw”

You are to write two functions. One which will encrypt a sentence and one which will decrypt one. This is a hard problem! Make sure you can decipher the text before you begin the code.
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