But it would be<p><pre><code>   input +&#x27;= input
</code></pre>
and the reverse<p><pre><code>   input -&#x27;= input
</code></pre>
or, alternatively,<p><pre><code>   input \&#x27;= input
</code></pre>
and<p><pre><code>   input !&#x27;= input
</code></pre>
If you code does this often enough, that may even be useful (but also, your code would be bad)