Get remaining letters in shell/terminal from alphabet which aren't used
<p>I try to make a hangman game in terminal
I want do display the char's which aren't used yet, example:
User has given the char's: A, B, C &amp; D. 
I want to show: "chars left: EFGHIJKLM....."</p>

<p>My Code:</p>

<pre><code>for x in {a..z}
do
    if [ "$x" != "$GUESSED" ]; then 
        LETTERSLEFT="$LETTERSLEFT $x"    
    fi
done
}
</code></pre>

<p>What I try to do:
If $x not in the guessed answer, add this to $lettersleft</p>