o">//</span><span class="nv">string</span><span class="ss">(</span><span class="nv">i</span><span class="ss">)</span><span class="o">//</span><span class="s1">&#39;</span><span class="s">]</span><span class="s1">&#39;</span>
       <span class="nv">write</span><span class="ss">(</span><span class="o">*</span>,<span class="o">*</span><span class="ss">)</span> <span class="o">&amp;</span>
        <span class="o">&amp;</span> <span class="nv">all</span><span class="ss">(</span><span class="nv">isdigit</span><s