code cracking 9 19, ,13,1,3,2,5,20,8, ,1, ,8,5,18,15,?,

We are asked to decipher the following code:

9,19,13,1,3,2,5,20,8,1,8,5,18,15

There are a number of simple cipher types ranging from simple to very complex.

This is a type of substitution cipher; these have been used for millenia. The cryptograms in newspapers or magazines are substitution ciphers -- each letter of the alphabet is paired with another letter without repetition.

A different type of cipher is the Caesar cipher where each letter is shifted along the alphabet by a certain number. (e.g. a=e, b=f, c=g etc...)

The type of cipher used here substitutes a number for the letter. The simplest such cipher numbers the letters of the alphabet in order: a=1,b=2,etc... This is used here.

The message reads: Is Macbeth a Hero

I is the 9th letter of the alphabet, s is the 19th letter, etc...