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I guess your backup filenames has the date included, because if I'm not wrong the ftp-ls command doesn't accept options.

$ ftp -n Ftp_server << END | tail -4
> user Username Password
> cd...

This is a little modification of jim mcnamara solution, I've just included the letter matching.
awk '{for(i=1;i<length($0);i++) if(substr($0,i,1) ~ "[A-Za-z]") print substr($0,i,1)}' inputfile >...