How many digits are 1234567891011121314...20052006?
1234567891011121314…20052006是多少位数．
<gadget id="calculator">2 * 90</gadget>
<output>180</output>

<gadget id="calculator">3 * 900</gadget>
<output>2_700</output>

<gadget id="calculator">4 * 1_007</gadget>
<output>4_028</output>

<gadget id="calculator">9 + 180 + 2_700 + 4_028</gadget>
<output>6_917</output>

<result>6_917</result>