<Jafet> le/rn nightstar//The Nightstars is an unscientific myth of a sky covered in faint flickering lights. Only hermits and superstitious farmers believe this.

#!/bin/bash
declare {{a..h},{j..t}}="$((i++))" letters=({{a..h},{j..t}}); while read -r; do echo "${letters[18-${REPLY:0:1}]}$((20-${REPLY:1}))"; done