STEP 6: Now we will use a loop to check each letter in our message. Let's set it up!

• From , drag Loop through String indented inside the function.
• Change "word" to message. The loop will iterate over each character or letter stored in the message variable.

While looping through each letter of message, we need to check whether that letter is in the alphabet. If it is, we can encrypt it! If it isn't, then it must be a symbol or a space, so we don't encrypt it.

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