Add everything I got

6a.sh

@@ -0,0 +1,46 @@
+#!/usr/bin/env bash
+
+winl=4
+win=''
+
+function add() {
+  win="${win:1}${1}"
+}
+
+function contains() {
+  # $1 what
+  # $2 where
+  local l=${#2}
+  local ret=1
+
+  while (( l-- )); do
+    [[ "$1" = "${2:$l:1}" ]] && ret=0 && break
+  done
+
+  return $ret
+}
+
+
+function unq() {
+  local l=${#1}
+
+  while (( --l )); do
+    contains ${1:$l:1} ${1:0:$l} && break
+  done
+
+  return $l
+}
+
+i=$(( $winl - 1 ))
+
+read -n $i win
+
+win=${win:0:1}${win}
+
+while read -n 1 a; do
+  let i++
+  add $a
+  unq "$win" && break
+done
+
+echo $i