Out[10]

In[10]:= ToCharacterCode[ "abcdefghijklmnopqrstuvwxyz"]

Out[10]=

  {97, 98, 99, 100, 101, 102, 103, 
    104, 105, 106, 107, 108, 109, 
    110, 111, 112, 113, 114, 115, 
    116, 117, 118, 119, 120, 121, 
    122}