position of letters in a string

*To*: mathgroup at smc.vnet.net*Subject*: [mg53803] position of letters in a string*From*: zak <chocolatez at gmail.com>*Date*: Fri, 28 Jan 2005 02:43:47 -0500 (EST)*Reply-to*: zak <chocolatez at gmail.com>*Sender*: owner-wri-mathgroup at wolfram.com

in the list of strings: lst={"catcatz","zrzttys"} i want some procedure to give the letters in every string a number depending on its position and discarding the recurrent letters such that: first string: c=1; a=2; t=3; z=4 second string: z=1; r=2; t=3; y=4; s=5 zak

**Follow-Ups**:**Re: position of letters in a string***From:*János <janos.lobb@yale.edu>