pan class="n">format</span><span class="p">(</span><span class="nb">str</span><span class="p">(</span><span class="n">upper</span><span class="p">),</span> <span class="nb">str</span><span class="p">(</span><span class="n">lower</span><span class="p">),</span>
                                              <span class="nb">str</span><span class="p">(</span><span class="n">left</span><span class="p">),</span> <span class="nb">str</span><span class="p">(</span><span class="n">right</span><span class="p">)))</s