13:I[87,["736","static/chunks/89fc4f0e-9e200ae6a0166583.js","401","static/chunks/363642f4-32903b9154b7835a.js","153","static/chunks/153-58eddeb032cc4608.js","131","static/chunks/131-05ce00cfd760e12b.js","87","static/chunks/87-b76b60eef573119a.js","286","static/chunks/app/problem/%5Bid%5D/page-45cf3875257fc32e.js"],"Header"] 14:I[1742,["736","static/chunks/89fc4f0e-9e200ae6a0166583.js","401","static/chunks/363642f4-32903b9154b7835a.js","153","static/chunks/153-58eddeb032cc4608.js","131","static/chunks/131-05ce00cfd760e12b.js","87","static/chunks/87-b76b60eef573119a.js","286","static/chunks/app/problem/%5Bid%5D/page-45cf3875257fc32e.js"],"ProblemView"] 15:T686,

You are given two integers $$$l$$$ and $$$r$$$, where $$$l \lt r$$$. We will add $$$1$$$ to $$$l$$$ until the result is equal to $$$r$$$. Thus, there will be exactly $$$r-l$$$ additions performed. For each such addition, let's look at the number of digits that will be changed after it.

For example:

if $$$l=909$$$, then adding one will result in $$$910$$$ and $$$2$$$ digits will be changed;
if you add one to $$$l=9$$$, the result will be $$$10$$$ and $$$2$$$ digits will also be changed;
if you add one to $$$l=489999$$$, the result will be $$$490000$$$ and $$$5$$$ digits will be changed.

Changed digits always form a suffix of the result written in the decimal system.

Output the total number of changed digits, if you want to get $$$r$$$ from $$$l$$$, adding $$$1$$$ each time.

Input

The first line contains an integer $$$t$$$ ($$$1 \le t \le 10^4$$$). Then $$$t$$$ test cases follow.

Each test case is characterized by two in

Interesting Function

Examples