#!/bin/sh

LIST="$(cat -)"
if test "$(echo "$LIST" | wc -l)" -lt ${2:-13}; then
	# Get the answer on your next guess
	echo "$LIST"
else
	# Letters you want to guess
	LETTERS="$(echo "$LIST" | sed 's/\(.\)/\1\n/g' | sort | uniq -c | sort -n)"
	echo "$LETTERS"
	grep5="$(echo "$LETTERS" | tac | awk '(p){printf("| grep " $2); p--;} ($2 == ""){p=5;}')"
	grep4="$(echo "$LETTERS" | tac | awk '(p){printf("| grep " $2); p--;} ($2 == ""){p=4;}')"
	grep3="$(echo "$LETTERS" | tac | awk '(p){printf("| grep " $2); p--;} ($2 == ""){p=3;}')"

	g5="$(sh -c "grep ^.....$ \"$1\" $grep5")"
	if sh -c "grep ^.....$ \"$1\" $grep5"; then
		echo
	elif sh -c "grep ^.....$ \"$1\" $grep4"; then
		echo
	elif sh -c "grep ^.....$ \"$1\" $grep3"; then
		echo
	fi
fi