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<p>On an alphabet board, we start at position <code>(0, 0)</code>, corresponding to character&nbsp;<code>board[0][0]</code>.</p>
<p>Here, <code>board = [&quot;abcde&quot;, &quot;fghij&quot;, &quot;klmno&quot;, &quot;pqrst&quot;, &quot;uvwxy&quot;, &quot;z&quot;]</code>, as shown in the diagram below.</p>
<p><img alt="" src="https://assets.leetcode.com/uploads/2019/07/28/azboard.png" style="width: 250px; height: 317px;" /></p>
<p>We may make the following moves:</p>
<ul>
<li><code>&#39;U&#39;</code> moves our position up one row, if the position exists on the board;</li>
<li><code>&#39;D&#39;</code> moves our position down one row, if the position exists on the board;</li>
<li><code>&#39;L&#39;</code> moves our position left one column, if the position exists on the board;</li>
<li><code>&#39;R&#39;</code> moves our position right one column, if the position exists on the board;</li>
<li><code>&#39;!&#39;</code>&nbsp;adds the character <code>board[r][c]</code> at our current position <code>(r, c)</code>&nbsp;to the&nbsp;answer.</li>
</ul>
<p>(Here, the only positions that exist on the board are positions with letters on them.)</p>