# Create empty string variable
    # Begin For Loop
        # Is this part of the string a letter? (A-Z, a-z)
             # Convert the letter to lower case and assign it to a variable
             # Is the (now lowercase) letter in the first half of the alphabet? ('m' is the midway point)
                  # Set a variable called Distance to 13
             # Else, it's in the 2nd half
                  # Set the Distance variable to -13
             # Encrypt the character (Don't really need to understand this line, or even the <= "m" stuff as Stuart gave it to us
        # Add the character to the end of our new string (We do this here so it happens for all the characters, whether we encrypted them or not)
    # End Loop
    # Return our string

def rot13(s):
    result = ""
    for char in s:
        if char.isalpha():
            if char.lower() <= "m":
                distance = 13
            else:
                distance = -13
            char = chr(ord(char)+distance)
        result = result + char
    return result