Write 35 natural numbers from 1 to 35 together continuously to form a large number: 1234567891011...333435, what is the number of digits in this large number?
将1到35这35个自然数连续地写在一起，构成了一个大数：1234567891011…333435，则这个大数的位数是多少．
<gadget id="calculator">26 * 2</gadget>
<output>52</output>

<gadget id="calculator">9 + 52</gadget>
<output>61</output>

<result>61</result>