">begin</span>  <span class="nv">optional</span> <span class="nv">starting</span> <span class="nv">position</span> <span class="nv">in</span> <span class="s2">&quot;</span><span class="s">str</span><span class="s2">&quot;</span> <span class="nv">to</span> <span class="nv">begin</span> <span class="nv">converting</span> <span class="nv">to</span>
       <span class="nv">uppercase</span>
<span class="k">end</span>    <span class="nv">optional</span> <span class="nv">ending</span> <span class="nv">position</sp