def random_letters(self):
length = random.randint(<NUM_LIT:1>, <NUM_LIT:10>)<EOL>letters = "<STR_LIT>".join(random.sample(string.ascii_lowercase, length))<EOL>return length, letters<EOL>
Generate and return a sequence of random letters.

The length of the returned string is also random, and is also
returned.

Returns
-------
length : int
    Length of the returned string.
letters : str
    String of random letters.