    <span class="k">while</span> <span class="kc">True</span><span class="p">:</span>
            <span class="n">token</span> <span class="o">=</span> <span class="n">tokens</span><span class="o">.</span><span class="n">pop</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
            <span class="n">word</span> <span class="o">=</span> <span class="n">token</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>

            <span class="c1"># correct 