<Taneb> learn Shannon forbade non mathematically minded people from reading his resarch papers. Taneb invented Shannon, his research papers, and Shannon\'s prohibition.

#!/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